WO2022042586A1

WO2022042586A1 - Liquid cleaning composition

Info

Publication number: WO2022042586A1
Application number: PCT/CN2021/114484
Authority: WO
Inventors: Yan Zheng; Haoran LI; Jinming Zhang
Original assignee: Ecolab Usa Inc.
Priority date: 2020-08-31
Filing date: 2021-08-25
Publication date: 2022-03-03
Also published as: CN114107996A

Abstract

Disclosed is a liquid cleaning composition comprising one or more of alkali, chelating agent, metal protectant, and surfactant, or the like, wherein said composition has a pH of at least 13. The present invention also provides a preparation method of the composition and use thereof.

Description

LIQUID CLEANING COMPOSITION

TECHNICAL FIELD OF THE INVENTION

The present invention generally relates to a liquid cleaning composition. More specifically, the present disclosure relates to a liquid cleaning composition having a pH of at least 13. The invention also provides a preparation method of the cleaning composition and use thereof.

BACKGROUND OF THE INVENTION

For bakery industry, one problem is that there will be stubborn carbonized soil formed on the surface of bakery appliances after long-term use. Such carbonized soil is difficult to be removed by existing conventional detergents without damaging the integrity of the surface layer of bakery appliances, especially the surface layer with a non-stick coating on it because the bakery wares commonly used in bakery industry are made of aluminum, which is easily corroded by products with strong degreasing effect. Hence, although it often takes a lot of manpower and time to remove the carbonized soil, it is still difficult to achieve desired cleaning effect.

Therefore, one challenge we are facing for cleaning products serving to clean carbonized soil is to effectively remove carbonized soil without damaging the integrity or stability of the surface and substrate of the appliances.

SUMMARY OF THE INVENTION

The present invention relates to a composition, having a pH of at least 13, for removing carbonized soil on a surface. The surface is a surface of an appliance that is preferably a metal appliance, such as an aluminum, copper or iron appliance. Also, the surface of the appliance optionally comprises a non-sticking coating, such as Teflon

coating. The composition described in the invention can remove carbonized soil on the appliance by soaking for a short time period (1-2 hours) without damaging the surface layer of the appliance. In addition, the composition according to the invention can still maintain excellent carbonized soil-cleaning effect after being diluted 20 times or even 30 times or more.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows appliances before and after being soaked in a 1: 20 diluted solution of the composition as described in the present invention at 65℃ for 1 hour. Top pictures: before soak; top pictures: after soak.

Figure 2 shows appliances before and after being soaked in a 1: 30 diluted solution of the composition as described in the present invention at 65℃ for 1 hour. Left pictures: before soak; right pictures: after soak.

Figure 3 shows appliances before and after being soaked in a 1: 30 diluted solution of the composition as described in the present invention at room temperature for 1 hour. Left pictures: before soak; right pictures: after soak.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure provides a liquid cleaning composition. The composition can be used in any applications in a commercial, industrial or home environment. The composition can be used in a variety of cleaning applications, including but not limited to the washing of metal articles, hard surfaces, appliances, or the like.

Embodiments of the present invention are not limited to specific cleaning applications, which can vary and be understood by skilled artisans in the art. It is further to be understood that all terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting in any manner or scope. For example, as used in this specification and the appended claims, the singular forms "a, " "an" and "the" can include plural referents unless the content clearly indicates otherwise.

Numeric ranges recited within the specification are inclusive of the numbers defining the range and each integer within the defined range. Throughout this disclosure, various aspects of this invention are presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges, fractional numbers, as well as individual numerical values within that range. For example, the description of a range, such as a range of 1 to 6, should be considered to have specifically disclosed sub-ranges, such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, or the like, individual numerical values, such as 1, 2, 3, 4, 5 and 6, as well as decimals and fractional numbers, such as 1.2, 3.8 and 1 ¹/ ₂ and 4 ³/ ₄ within the range. This applies regardless of the width of the range.

So that the present disclosure may be more readily understood, certain terms are firstly defined. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the disclosure pertain. Many methods and materials similar, modified, or equivalent to those described herein can be used in the practice of the embodiments of the present disclosure without undue experimentation. The preferred materials and methods are described herein. The following terminology will be used in accordance with the definitions set out in below description and the claims.

The term "about, " as used herein, refers to variation in the numerical quantity that can occur, for example, through typical measuring technologies and devices with respect to any quantifiable variables (including but not limited to, mass, volume, and time) . In addition, in the case of solid and liquid handling procedures used in the real world, there are some unintentional errors and variations that may be caused by differences in the manufacture, source or purity of the ingredients used to make the compositions or carry out the methods, or the like. The term "about" also encompasses amounts that differ due to different equilibrium conditions for a composition resulting from a particular initial mixture. These changes are also covered by this term “about” . Whether or not modified by the term "about" , the claims include equivalents to the quantities.

The methods and compositions of the present disclosure may comprise, consist essentially of, or consist of the components and ingredients of the present invention as well as other ingredients described herein. As used herein, "consisting essentially of" means that the methods and compositions may include additional steps, components or ingredients, but only if the additional steps, components or ingredients do not materially alter the basic and novel characteristics of the claimed methods and compositions.

The term "actives" or "percent actives" or "percent by weight actives" or "actives concentration" are used interchangeably herein and refers to the concentration of those ingredients involved in cleaning, expressed as a percentage minus inert ingredients such as water or salts.

As used herein, the term "appliances" refers to articles such as food and cooking appliances, such as bakery appliances, plates, and other hard surfaces such as operating tables, glass panels, floors, or the like. As used herein, the term "cleaning" refers to washing, cleaning, or rinsing of the appliances.

As used herein, the term "metal appliance" refers to appliances made of metal, for example, aluminum appliance, copper appliance, iron appliance, or the like. The surface of the metal appliance may comprise an additional non-sticking layer. The non-sticking layer may be, for example, a Teflon

coating, which is located on the metal substrate of the metal appliance to be cleaned.

The term "weight percent" and variations thereof, as used herein, refer to the concentration of a substancem, i.e., the weight of that substance divided by the total weight of the composition and multiplied by 100. It is understood that, as used here, "weight percent" is intended to be synonymous with "weight %, " "wt %, " etc.

The methods, systems, instruments, and compositions may comprise, consist essentially of, or consist of the components and ingredients as well as other ingredients described herein. As used herein, "consisting essentially of" means that the methods, systems, instruments and compositions may include additional steps, components or ingredients, but only if the additional steps, components or ingredients do not materially alter the basic and novel characteristics of the claimed methods, systems, instruments and compositions.

Alkalinity source of the composition

The composition of the invention may include an effective amount of one or more alkalinity sources. The effective amount of the one or more alkalinity sources shall be regarded as an amount providing a pH of at least 13. For example, the composition as described in the invention can have a pH of any arbitrary numerical value of at least 13, such as at least 13.1, at least 13.2, at least 13.3, at least 13.4, at least 13.5, or the like; for example, the pH value is about 13.1, about 13.2, about 13.3, about 13.4, about 13.5, about 13.6, about 13.7, about 13.8, about 13.9, or the like.

Examples of suitable alkalinity source of the compositions according to the present invention include, but are not limited to, caustic alkali-based alkalinity sources, such as alkali metal hydroxides; other suitable alkalinity sources may include metal silicates and organic alkalinity sources, or the like. Exemplary alkali metal carbonates that may be used include, but are not limited to, sodium carbonate, potassium carbonate, or mixtures thereof. Exemplary alkali metal hydroxides that can be used include, but are not limited to, sodium hydroxide, lithium hydroxide, or potassium hydroxide.

Organic alkalinity sources are usually strong nitrogenous bases, including for example alkanolamine, or the like. Typical examples of alkanolamines include monoethanolamine, monopropanolamine, diethanolamine, dipropanolamine, triethanolamine, tripropanolamine, or the like. In the embodiments, the organic alkalinity source is monoethanolamine.

Generally, the alkalinity sources are usually obtained in aqueous form or powdered form. In embodiments, the composition according to the present invention comprises alkalinity source in an amount ranging between about 2wt%and about 30 wt%, such as a range of 2-20 wt%, 3-25 wt%, 5-10 wt%, 5-15 wt%, 10-25 wt%, or the like, including any numerical values within the range, such as about 3 wt%, about 4 wt%, about 4.5 wt%, about 5 wt%, about 5.5 wt%, about 6 wt%, about 6.5 wt%, about 8 wt%, about 10 wt%, about 10.5 wt%, about 15 wt%, about 20 wt%, about 22.5 wt%, about 25 wt%, about 30 wt%of the alkalinity source, or the like. In some embodiments, the alkalinity source according to the invention is one or more of NaOH, KOH, monoethanolamine, diethanolamine or triethanolamine.

In some embodiments, the composition according to the invention comprises NaOH, KOH and monoethanolamine, as alkalinity sources. In some embodiments, the weight ratio between NaOH and KOH is about 3: 1 -1: 3, for example, about 3: 1, about 2: 1, about 4: 3, about 3: 4, about 1: 2, or the like. In some embodiments, the weight ratio between the alkali metal hydroxide (such as sodium hydroxide and/or potassium hydroxide) and alkanolamine may be about 1: 2 -5: 1, for example, about 1: 2, about 1: 1, about 2: 1, about 3: 1, about 4: 1, about 5: 1, or the like.

Chelating agent

The composition of the invention can also comprise an effective amount of chelating agent. Generally, a chelating agent is a molecule that can coordinate (i.e. bind) with metal ions usually existing in water source to prevent metal ions from interfering with the function of a rinse aid or other ingredients of other cleaning compositions. In some embodiments, the composition of the invention comprises chelating agent in an amount ranging from about 3 to 12 wt%, for example 3-11 wt%, 3.5-12 wt%, 4-12 wt%, 5-12 wt%, 6-12 wt%, 7-12 wt%, 8-12 wt%, 9-12 wt%, 11-12 wt%, or the like, including any numerical values within the range, such as about 3 wt%, about 4 wt%, about 4.5 wt%, about 5 wt%, about 5.5 wt%, about 6 wt%, about 6.5 wt%, about 8 wt%, about 10 wt%, about 10.5 wt%, about 11 wt%, about 11.5 wt%, about 12 wt%of chelating agent, or the like.

Some examples of suitable chelating agents include ethylenediamine tetraacetic acid (EDTA) , diethylenetriamine pentaacetic acid (DTPA) , methylglycine diacetic acid (MGDA) , glutamic acid diacetic acid (GLDA) . In some embodiments, the chelating agent of the invention includes a sodium salt of EDTA, such as tetrasodium EDTA.

Chelating agents/sequestrants are further discussed in Kirk Othmer, Encyclopedia of chemical technology, Third Edition, Vol. 5, pp. 339-366, and Vol. 23, pp. 319-320, the disclosure of which is incorporated herein by reference.

In some embodiments, the weight ratio between the chelating agent and alkali metal hydroxide (such as sodium hydroxide and/or potassium hydroxide) as described in the invention is about 1: 5 -5: 1, such as about 1: 5, about 1: 4, about 1: 3, about 1: 2, about 1: 1, about 2: 1, about 3: 1, about 4: 1, about 5: 1, or the like.

Metal protectant

In some embodiments, the composition of the invention further comprises a metal protectant. The metal protectant can be metal silicate, including but not is limited to sodium silicate or potassium silicate or sodium metasilicate or potassium metasilicate. In some embodiments, the metal protectant comprises potassium silicate and/or sodium metasilicate. In some embodiments, the composition of the invention comprises potassium silicate in an amount ranging from 8 to 30 wt%, such as a range of 8-25 wt%, 10-25 wt%, 15-30 wt%, 20-25 wt%, or the like, including any numerical values within the range, such as about 8 wt%, about 10 wt%, about 15 wt%, about 17.5 wt%, about 20 wt%, about 25 wt%, about 25.5 wt%, about 26.5 wt%, about 28 wt%, about 30 wt%of potassium silicate, or the like. In some embodiments, the metal protectant comprises sodium metasilicate in an amount ranging from 2 to 20 wt%, such as a range of 3-10 wt%, 4-10 wt%, 6-10 wt%, or the like, including any numerical values within the range, such as about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 5.5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 10 wt%of sodium metasilicate, or the like.

In some embodiments, the weight ratio between the metal protectant and alkali metal hydroxide (such as sodium hydroxide and/or potassium hydroxide) can be about 1: 2 - 5: 1, such as about 1: 2, about 1: 1, about 2: 1, about 3: 1, about 4: 1, about 5: 1, or the like.

Surfactant

The surfactant may be those known in the art. For example, the surfactant can be selected from one or more of betaine, amine oxide and alkyl polyglycosides, or the like; and all combinations thereof are explicitly covered in various non limiting embodiments.

Examples of suitable betaines include cocamidopropyl betaine; hexadecyl dimethyl betaine; C _12-14 acylamidopropyl betaine; C _8-14 acylamidohexyldiethyl betaine; 4-C _14-16 acylmethylamidodiethylammonio-1-carboxybutane; C _16-18 acylamidodimethyl betaine; C _12-16 acylamidopentanediethyl betaine; and C _12-16 acylmethylamidodimethyl betaine. In some embodiments, the composition of the invention comprises cocamidopropyl betaine.

Amine oxides are multifunctional weak cationic surfactants. In some embodiments, the amine oxide surfactant is dodecyldimethylamine oxide or coco-dimethylamine oxide.

Alkyl polyglycosides (simplified as APG) are those synthesized from glucose and fatty alcohol, referring to the glycosides with two or more sugar units in complex glycosidic compounds, which are collectively referred to as alkyl polyglycosides.

In some embodiments, the surfactant contained in the composition of the invention comprises cocamidopropyl betaine, dodecyldimethylamine oxide and alkyl polyglycoside. In some embodiments, the composition of the invention comprises sodium metasilicate in an amount ranging from about 2 to 8 wt%, such as a range of 3-10 wt%, 4-10 wt%, 6-10 wt%, or the like, including any numerical values within the range, such as about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 5.5 wt%, about 6 wt%, about 7 wt%, about 8 wt%, about 10 wt%of sodium metasilicate, or the like. In some embodiments, the mass ratio between the dodecyldimethylamine oxide and cocamidopropyl betaine is about 1: 5 -5: 1, for example, about 1: 5, about 1: 4, about 1: 3, about 1: 2, about 1: 1, about 2: 1, about 3: 1, about 4: 1, about 5: 1, or the like. In some embodiments, the mass ratio between the dodecyldimethylamine oxide and APG is about 1: 5 -5: 1, such as about 1: 5, about 1: 4, about 1: 3, about 1: 2, about 1: 1, about 2: 1, about 3: 1, about 4: 1, about 5: 1, or the like.

Additive components

The composition according to the invention can further comprise an additive component. Additive components, such as aromatics (odorants) and the like, can be added into the composition as needed to provide required properties and functionalities. The content of additive components can be determined by those skilled in the art according to conventional dosage in the art.

In some embodiments, the invention provides an aqueous solution composition, comprising one or more active substances of alkali, chelating agent, metal protectant and surfactant.

In some embodiments, the invention provides an aqueous solution composition, comprising the following components:

(i) an alkali hydroxide and/or alkanolamine,

(ii) a chelating agent selected from one or more of EDTA, GLDA, MGDA, or salts thereof,

(iii) a metal protectant;

(iv) a surfactant selected from one or more of a betaine, an amine oxide, or an alkyl polyglycoside (APG) ,

wherein the aqueous solution composition has a pH of at least 13.

(i) an alkali hydroxide and/or alkanolamine, the alkali hydroxide and/or organic alkali being present in an amount of about 2-30 wt%based on a total weight of the composition,

(ii) a chelating agent selected from one or more of EDTA, GLDA, MGDA, or salts thereof, the chelating agent being present in an amount of about 3-12 wt%based on the total weight of the composition,

(iii) a metal protectant, such as potassium silicate and/or sodium metasilicate;

(iv) a surfactant selected from one or more of a betaine, an amine oxide, or an alkyl polyglycoside (APG) , the surfactant being present in an amount of about 2-8 wt%based on the total weight of the composition,

wherein the composition has a pH of at least 13.

In some embodiments, the composition according to the invention comprises:

(i) an alkalinity source selected from one or more of NaOH, KOH or monoethanolamine, in an amount of 2-30 wt%of the composition,

(ii) a chelating agent selected from one or more of EDTA, GLDA, MGDA, or salts thereof, in an amount of 6-12 wt%of the composition,

(iii) a metal protectant comprising 8-30 wt%of potassium silicate and/or 2-10 wt%of sodium metasilicate; and

(iv) a surfactant selected from one or more of a cocamidopropyl betaine, dodecyldimethylamine oxide and an alkyl polyglycoside, in an amount of 2-8 wt%of the composition,

wherein the composition has a pH of at least 13, preferably at least 13.3, more preferably at least 13.5; for example, the composition has a pH of 13.75.

In some embodiments, the weight ratio between NaOH and KOH is about 3: 1 -1: 3. In some embodiments, the weight ratio between the sodium hydroxide and/or potassium hydroxide and monoethanolamine may be about 1: 2 -5: 1. In some embodiments, the weight ratio between chelating agent and alkali metal hydroxide (such as sodium hydroxide and/or potassium hydroxide) as described in the invention is 1: 5 -5: 1. In some embodiments, the weight ratio between the metal protectant and alkali metal hydroxide (such as sodium hydroxide and or potassium hydroxide) can be about 1: 2 -5: 1. In some embodiments, the mass ratio between the dodecyldimethylamine oxide and the cocamidopropyl betaine is about 1: 5 -5: 1. In some embodiments, the mass ratio between the dodecyl dimethylamine oxide and APG is about 1: 5 to 5: 1.

Exemplary preparation method

The present disclosure further provides a method for preparing the aqueous solution composition according to the invention. In an embodiment, the method comprises the following steps:

i. adding water to a sink and then starting mixing;

ii. adding alkali metal hydroxides such as sodium hydroxide and/or potassium hydroxide in powder form and chelating agents such as tetrasodium EDTA to the sink, and stirring at room temperature for 20 minutes to dissolve all ingredients;

iii. adding surfactants containing betaine, dimethylamine oxide, and alkyl polyglycoside and monoethanolamine in sequence, and stirring until homogeneous after each addition;

iv. adding metal protectants such as potassium silicate and sodium metasilicate to the sink and stirring for 1 hour until the solution is homogeneous and no particle is present at the bottom of the sink.

Usage

The composition according to the invention can be directly applied to the surface to be cleaned. In one embodiment, the cleaning composition according to the invention is used to remove carbonized soil by the following method: (i) soaking the surface to be cleaned completely into the composition solution according to the invention for 30-120 minutes; and (ii) rinsing the surface to remove softened carbonated soil. Optionally, a step of diluting the cleaning composition of the present invention at a ratio of 1: 20 or 1: 30 is performed before step (i) . In some embodiments, hot water of 60-70℃ may be used for dilution. Furthermore, an external mechanical force can be applied after step (ii) to remove the carbonized soil, wherein the external mechanical force can be applied by shaking, friction, brushing and the like. In some embodiments, the surface is the surface of an appliance, which is a metal appliance, such as an aluminum appliance. Optionally, the surface of the appliance comprises a non-sticking coating, such as a Teflon coating.

Examples

The aqueous solution composition according to the invention was formulated according to the following examples. The raw materials were commercially available.

Example 1

According to the preparation method of the invention, the compositions in below Table 1 were formulated and obtained:

Table 1

Formulation	1# (wt%)	2# (wt%)	3# (wt%)	4# (wt%)
Deionized water	55	50	41	46
NaOH	5	5	8	5
KOH	8	8	4	5
Tetrasodium EDTA	3	3	3	3
Cocamidopropyl betaine	2	4	4	2
Dodecyldimethylamine oxide	2	4	4	2
Alkyl polyglycoside	1	2	2	1
Monoethanolamine	6	6	6	11
Potassium silicate	10	10	20	20
Sodium metasilicate	8	8	8	5

Determination of pH showed that all the compositions had a pH of higher than 13 at ambient temperature.

Example 2

Using the composition prepared in Example 1, the surfaces of bakery appliances (having a non-sticking layer) with carbonized soil thereon were cleaned according to the method described in the invention. The pictures showing the effects were listed in Figures 1 to 3.

Example 3

After cleaning the surfaces of the metal appliances using the composition of the invention, good removal effect of carbonized soil and good protection effect of the surfaces of the metal substrates were produced. See Tables 2 and 3 below.

Table 2 Removal rate of carbonized soil by the composition of the invention

Table 3 Protective effect of the present composition on metal substrate

*mpy: Annual corrosion rate

Throughout the disclosure, all combinations of the above embodiments are hereby explicitly covered in one or more non-limiting examples, even though such combination is not described word by word in a single paragraph or section above. In other words, the examples explicitly covered may include any one or more elements described above that are selected and combined from any part of the present disclosure. In various non-limiting examples, all values and ranges between the values mentioned above inclusive said values are explicitly covered herein.

One or more of the numerical values described above may vary ±5%, ±10%, ±15%, ±20%, ±25%, or the like. Undesirable results can be obtained from each member of the Markush group independent of all other members. Specific embodiments can be fully supported depending on each member alone and/or in combination within the scope of the appended claims. The subject matter of all combinations of independent and dependent claims, individually and multiple dependent, is explicitly covered herein. The present disclosure is illustrative and includes words for the purpose of description rather than limitation. Many modifications and variations of the present disclosure may be made in accordance with the above teachings, and the present invention may be practiced in a way different from those specifically described herein.

It should also be understood that any ranges and sub-ranges, on which the description of different examples of the present disclosure relied, independently and collectively fall within the scope of the appended claims, and should be understood as all ranges including the integers and/or fractions therein are described and covered, even if such numerical values are not explicitly written herein. It is easy for those skilled in the art to recognize that the enumerated ranges and sub-ranges fully describe and implement different examples of the present disclosure, and such ranges and sub-ranges can be additionally described as related half, one third, one fourth, one fifth, or the like. As an example only, a range of "0.1 to 0.9" can be further described as one third of the lower part, i.e. 0.1 to 0.3, one third of the middle part, i.e. 0.4 to 0.6, and one third of the upper part, i.e. 0.7 to 0.9, which individually and collectively fall within the scope of the appended claims, and which may be relied on individually and/or collectively, and provide sufficient support for specific examples within the scope of the appended claims. In addition, for languages that define or modify the scope, such as "at least" , "greater than" , "less than" , "no more than" and analogues thereof, it should be understood that such languages include sub-ranges and/or upper or lower limit. As another example, a range of "at least 10" inherently includes a sub-range of at least 10 to 35, a sub-range of at least 10 to 25, a sub-range of 25 to 35, or the like, and each sub-range can be relied on individually and/or collectively, and can provide sufficient support for specific examples within the scope of the appended claims. Finally, a single number within the disclosed range can be relied on and provide sufficient support for the specific examples within the scope of the appended claims. For example, a range of "1 to 9" includes each individual integer, such as 3, and individual numbers including a decimal point (or fraction) , such as 4.1, which can be relied on individually and/or collectively, and can provide sufficient support for specific examples within the scope of the appended claims.

Claims

A composition, comprising the following components:

(i) an alkali hydroxide and/or alkanolamine, said alkali hydroxide and/or organic alkali being present in an amount of about 2-30 wt %based on a total weight of said composition;

(ii) a chelating agent selected from one or more of EDTA, GLDA, MGDA, or salts thereof, said chelating agent being present in an amount of about 3-12 wt%based on the total weight of said composition;

(iii) a metal protectant;

(iv) a surfactant selected from one or more of a betaine, an amine oxide, and an alkyl polyglycoside (APG) , said surfactant being present in an amount of about 2-8 wt%based on the total weight of said composition;

wherein said composition is an aqueous solution with a pH of at least 13.
The composition according to claim 1, wherein said alkali hydroxide is sodium hydroxide and/or potassium hydroxide, optionally said sodium hydroxide and potassium hydroxide having a weight ratio ranging from 3: 1 to 1: 3.
The composition according to claim 1 or 2, wherein said chelating agent is present in an amount of about 6-12 wt %based on the total weight of said composition.
The composition according to any one of claims 1 to 3, wherein said alkanolamine is monoethanolamine.
The composition according to any one of claims 1 to 4, wherein said chelating agent is tetrasodium EDTA.
The composition according to any one of claims 1 to 5, wherein said betaine surfactant is cocamidopropyl betaine.
The composition according to any one of claims 1 to 6, wherein said amine oxide surfactant is dodecyldimethylamine oxide or coco-dimethylamine oxide.
The composition according to any one of claims 1 to 7, wherein said metal protectant comprises potassium silicate and/or sodium metasilicate, preferably said metal protectant comprises potassium silicate in an amount of about 2-10 wt %and/or sodium metasilicate in an amount of about 1-5 wt %based on the total weight of said composition.
The composition according to any one of claims 1 to 8, wherein said composition further comprises an ordorant.
A method of cleaning a surface, said method comprising:

contacting said surface with the composition according to any one of claims 1 to 9.
The method according to claim 10, wherein said composition is further in a diluted form.
The method according to any one of claims 10 to 11, wherein said composition is diluted at a ratio ranging from 1: 20 to 1: 30.
The method according to any one of claims 10 to 12, wherein said surface is a metal surface, preferably, said metal surface comprises a non-stick layer.
The method according to any one of claims 10 to 13, further comprising rinsing said surface with water.
The method according to any one of claims 13 to 14, wherein said metal is aluminum, iron, or copper.
A method of applying the composition according to any one of claims 1 to 9, said method comprising:

formulating the composition according to any one of claims 1 to 9; and

contacting a surface with said cleaning composition.
The method according to claim 16, wherein said composition is further in a diluted form, preferably, said composition is diluted at a ratio ranging from 1: 20 to 1: 30.
The method according to claim 16 or 17, wherein said surface is a metal surface, preferably, said metal surface comprises a non-sticking layer.
The method according to any one of claims 16 to 18, further comprising rinsing said surface with water.
The method according to any one of claims 18 to 19, wherein said metal is aluminum, iron, or copper.
The method according to any one of claims 16 to 19, further comprising rinsing said surface with water.