EA031869B1 - Paste composition for cleaning hard surfaces - Google Patents

Abstract

Disclosed is a cream for cleaning hard surfaces, comprising (i) 0.5 to 15 wt.% Anionic surfactant, at least 90 parts of which are the calcium or magnesium salt of a linear alkyl benzene sulfonic acid or a mixture of two; (ii) 10-50 wt.% abrasive system comprising a first abrasive material, which is calcite, and a second abrasive material other than calcite, having a Mohos index of less than 3.0, and the mass ratio of said first to said second abrasive material is from 1: 0.15 to 1: 6 and the pH of the specified composition is in the range of 6-7.5. The composition removes crusted oily or fatty contaminants from hard surfaces.

Description

The invention relates to a composition for removing crusty hardened oil or grease contaminants from a solid surface.

Prior art

Hard surface cleaning compositions are designed to clean surfaces such as cooktops, sinks, hobs, pipes, platforms and contaminated products such as kitchen utensils, cutlery and earthenware.

Such surfaces are susceptible to stubborn dirt, as they often come in contact with oily or greasy substances, such as deep fat. Over a period of time, as a rule, such contaminants tend to harden or crust. Oil stains and grease are usually easy to remove if they are not hardened or crusty, but after the formation of a crust, for example as a result of aging or heating, the stains become especially difficult to remove. Cleaning is easier until the stain is crusty. If the surfaces are not quickly cleaned, then the crusty oil or grease can firmly bind to a hard surface.

Compositions for cleaning hard surfaces, as a rule, have a high pH value. However, low pH formulations are also known. High pH compositions are better suited for removing contaminants due in large part to their high alkalinity. However, such compositions are aggressive. On the other hand, compositions with a neutral or slightly acidic pH are not so aggressive, but they are not very effective. Thus, such compositions often contain more solid abrasive particles, typically particles with a Mohs index above 3.5.

IN204326 discloses washing rod compositions having about 14% anionic surfactant, which is prepared by reacting linear alkylbenzenesulfonic acid (LAS acid) with a stoichiometric excess of dolomite. The reaction results in a mixture of calcium LAS and magnesium LAS, leaving a significant portion of the free dolomite to serve as an abrasive. Given the specific format of the product, which is given as an example, the composition contains more than 70% of the total amount of abrasive materials. Usually the rods are used with the necessary accessories or a nylon brush. Such accessories enhance the intrinsic abrasive effect of the composition, and at levels in the range of 70%, the composition is highly abrasive in nature.

WO 2015/078679 A1 (Unilever) discloses a paste composition suitable for washing dishes. The composition helps to remove difficult to handle contaminants such as burnt soot and / or burnt food and fat with significantly less effort and time compared to at least some of the known products. The paste has an inorganic alkaline substance with a pH above 11, an alkalinity reserve of more than 45 in a 1% solution and an abrasive with a Mohs index of more than 3.5. The highly alkaline nature of the composition enhances the cleaning effect of the abrasive.

WO 2015/067438 A1 (Unilever) discloses a hard surface cleaning paste, where the main surfactant is Ca / Mg LAS obtained by the reaction of LAS acid with dolomite. The composition also contains fatty acids or esters that give a non-grainy feel and suitable removal of contamination. The composition contains abrasive material.

WO 2004013268 A1 (Unilever) discloses a synergistic cleaning composition having 0.140 wt.% Surfactant and 0.1-40 wt.% Abrasive in the form of particles of a certain shape, having a roundness coefficient of 0.6-1.0. Dolomite is used to neutralize linear alkylbenzenesulfonic acid (LAS), resulting in a mixture of linear alkylbenzenesulfonates having a mixture of calcium and magnesium as counterions.

Therefore, with regard to the prior art relating to cleaning compositions for hard surfaces in the form of a paste, on the one hand, there are highly alkaline compositions with a high sodium salt content of linear alkylbenzenesulfonic acid as an anionic surfactant, on the other hand there are neutral or slightly acidic compositions, containing calcium-LAS and / or magnesium-LAS, which either contain high concentrations of coarse abrasive or do not contain abrasive at all.

Thus, there is an unmet need for cleaning compositions in the form of a paste or cream with a neutral or slightly acidic pH, having an optimal abrasive content and type, but which are very effective against crusty oily / greasy soils on hard surfaces.

Summary of the invention

It has now been found that neutral or slightly acidic paste or cream compositions can be more effective against crusty oily / greasy contaminants on a solid surface by using an abrasive system having two types of softer abrasive materials with a weight ratio in a certain range. An unexpected conclusion is that calcite with a Mohs index of 3 and a second abrasive with an index of less than 3, which make up the abrasive system, provide very good removal of contaminants, even if each of them is considered slightly abrasive in accordance with the specified scale.

- 1 031869

According to a first aspect, there is disclosed a cream composition for cleaning hard surfaces, having (i) 0.5-15 wt.% Anionic surfactant, at least 90 parts of which is a calcium or magnesium salt of linear alkyl benzene sulfonic acid, or a mixture of both of these salts ;

(ii) 10-50% by weight of an abrasive system comprising a first abrasive material which is calcite and a second abrasive material other than calcite having a Mohs index of less than 3.0, wherein the mass ratio of the first to said second abrasive material is from 1 : 0.15 to 1: 6 and the pH of the composition is in the range of 6-7.5.

In accordance with a second aspect, the use of the composition of the first aspect is disclosed for removing crusty oily or greasy contaminants from a hard surface.

According to a third aspect, a method is disclosed for removing crusty oily or greasy contaminants on a hard surface, a method having the steps of applying the composition of the first aspect to it, cleaning the contaminated part with a hard brush or cloth and wiping with a damp cloth.

DETAILED DESCRIPTION OF THE INVENTION

The disclosed cream composition comprises (i) 0.5-15 wt.% Of an anionic surfactant, at least 90 parts of which are a calcium or magnesium salt of a linear alkyl benzene sulfonic acid, or a mixture of these two salts;

(ii) 10-50% by weight of an abrasive system comprising a first abrasive material which is calcite and a second abrasive material other than calcite having a Mohs index of less than 3.0, wherein the mass ratio of the first to said second abrasive material is from 1 : 0.15 to 1: 6 and the pH of the composition is in the range of 6-7.5.

Hard surface.

Compositions disclosed herein are generally suitable for cleaning hard surfaces. A hard surface can be any household or industrial surface, but domestic surfaces are considered separately, and the invention will be further explained with reference to this application. Typical hard surfaces include glass, wood, tiles and other ceramic materials, metal surfaces, polished stones and polished concrete, more preferably stone or concrete kitchen worktops, hobs, pipes, platforms, sinks, glass windows and stoves and tiles.

Composition.

A composition in the form of a cream is disclosed. The term cream, as used herein, also includes a closely related paste format, and all references to the term cream should be construed as including the equivalent paste format.

Such products are usually packaged in soft tubes, plastic bottles, sachets and also cans and other types of packaging.

Anionic surfactants.

The composition essentially includes 0.5-15 wt.% Anionic surfactants, which is mainly responsible for the cleaning effect. Excess anionic surfactant often causes too much foaming, resulting in the use of more water for rinsing. At least 90% of the total anionic surfactant is a calcium or magnesium linear alkylbenzenesulfonic acid salt or a mixture thereof. This can be obtained by neutralizing a suitable precursor of an anionic surfactant, such as linear alkylbenzenesulfonic acid, an alkaline salt of calcium or magnesium, for example carbonate. A preferred method for preparing a mixture of calcium and magnesium salts is to neutralize the acidic precursor of a surfactant (linear alkylbenzenesulfonic acid) with a dolomite mineral. When a stoichiometric excess of the mineral is used, part of it is used to neutralize, and the unreacted part usually remains in the neutralized mass, which is subsequently incorporated into the cleaning compositions to serve as a solid abrasive.

Preferred compositions have a total content of anionic surfactant of 2-12 wt.%, More preferably 3-8 wt.%. In other preferred compositions, the total content of the anionic surfactant is a calcium or magnesium salt of said linear alkylbenzenesulfonic acid or a mixture of two salts.

The term dolomite group or, in a general sense, dolomites refers to minerals with unusual trigonal symmetry and with the general formula AB (CO ₃ ) ₂ , where A is calcium and B is magnesium. Dolomites can be selected from natural materials such as ancher Ca (Fe, Mg, Mn) (CO ₃ ) ₂ , benstoneite (Ba, Sr) ₆ (Ca, Mn) ₆ Mg (CO ₃ ) ₁₃ , dolomite CaMg (CO ₃ ) ₂ and gantite CaMg ₃ (CO ₃ ) ₄ . The term dolomite refers to a particular mineral from the class of dolomites, and its molecular formula is as previously indicated. The main anionic (negatively charged) units of this class consist of a triangle, where the carbon atom is in the center. At each corner of the triangle is an oxygen atom. Triple

- 2 031869 The symmetry of a triangle explains the trigonal symmetry that many members of this class possess. The structure of the dolomite group minerals is layered such that metal A ions occupy one layer, followed by a carbonate layer, followed by a layer of metal B ions, followed by another carbonate layer.

The remainder of the anionic surfactant may be any suitable surfactant, such as water-soluble salts of organic sulfur reaction products having alkyl radicals containing 8-22 carbon atoms and sulfuric acid esters. Non-limiting examples of anionic surfactants include alkyl polyols (ethoxylates), sodium sulfate lauryl ether, and sulfonate methyl ether.

The composition may also contain other surfactants (other than anionic). These include nonionic, cationic, amphoteric and zwitterionic surfactants. However, their role is limited to providing secondary benefits, such as reduced foaming or increased cleaning effect of anionic surfactants. Accordingly, it is preferable that when they are present, their total amount is less than 15 wt.%, More preferably less than 10 wt.% And most preferably 1.5-5 wt.%.

Preferred compositions have 0.5-5 wt.% Non-ionic surfactants. Suitable nonionic surfactants can be broadly described as compounds obtained by condensation of alkylene oxide groups that are hydrophilic in nature, with an organic hydrophobic compound, which may be aliphatic or alkyl aromatic in nature. The length of the hydrophilic or polyoxyalkylene radical which is condensed with any particular hydrophobic group can be easily adjusted to obtain a water-soluble compound having the desired balance between the hydrophilic and hydrophobic elements.

Specific examples include the condensation product of aliphatic alcohols having 8-22 carbon atoms in a linear or branched chain configuration with ethylene oxide, such as a condensate of coconut oil ethylene oxide having 2-15 moles of ethylene oxide per mole of coconut alcohol; condensates of alkyl phenols, the alkyl group of which contains 6-12 carbon atoms with 5-25 moles of ethylene oxide per mole of alkyl phenol; condensates of the reaction product of ethylene diamine and propylene oxide with ethylene oxide, a condensate containing 40-80% by weight of polyoxyethylene radicals by weight and having a molecular weight of 5000-11000; tertiary amine oxides of structure R ₃ NO, where one R group is an alkyl group containing 8-18 carbon atoms, and the rest are methyl, ethyl or hydroxyethyl groups, for example dimethyldodecylamine oxide; tertiary phosphine oxides of structure R ₃ PO, where one R group is an alkyl group containing 10-18 carbon atoms and the rest is an alkyl or hydroxyalkyl group containing 1-3 carbon atoms, for example dimethyldodecylphosphine oxide; dialkyl sulfoxides with an R2SO structure, wherein the R group is an alkyl group containing 10-18 carbon atoms and the other is methyl or ethyl, for example methyl tetradecyl sulfoxide; fatty acid alkyloloamides; condensates of alkylene oxide with fatty acid alkylolamides and alkyl mercaptans. Nonionic surfactants can also be selected from a number of alkyl polyglucosides.

Suitable amphoteric surfactants are derivatives of aliphatic secondary and tertiary amines containing an alkyl group of 8-18 carbon atoms, and an aliphatic radical substituted with an anionic group that improves water solubility, for example sodium 3-dodecylaminopropionate, sodium 3-dodecylaminopropanesulfonate and No. 2-hydroxydodecyl-No. sodium methyltaurate. Suitable cationic detergent surfactants are quaternary ammonium salts having an aliphatic radical of 8-18 carbon atoms, for example cetyltrimethylammonium bromide.

Suitable zwitterionic surfactants that can be used are derivatives of aliphatic quaternary ammonium, sulfonium and phosphonium having an aliphatic radical with 8-18 carbon atoms and an aliphatic radical substituted with an anionic group that improves solubility in water, for example 3XX-dimethylxmonium hexadecyl ) betaine propane-1-sulfonate, betaine 3- (dodecylmethylsulfonium) and betaine 3- (cetylmethylphosphonium) ethanesulfonate.

Further examples of suitable surfactants are provided in the well-known books of Surface Active Agents Vol. 1, by Schwartz & Perry, Interscience 1949, Vol. 2 by Schwartz, Perry & Berch, Interscience 1958 and / or current edition of McCutcheon's Emulsifiers and Detergents published by Manufacturing Confectioners Company or Tenside-Taschenbuch (Surfactants Handbook), N. Stache, 2nd Edn. , Carl Hauser Verlag, 1981.

Abrasive materials.

The cream composition includes 10-50 wt.% The abrasive system, which consists of the first abrasive material, which is calcite, and a second abrasive material other than calcite, having a Mohs index of less than 3.0. The mass ratio of the specified first to second abrasive

- 3 031869 material is in the range from 1: 0.15 to 1: 6.

In preferred compositions, the abrasive system comprises 20-45% by weight of the total weight of the composition.

The first abrasive is calcite (calcium carbonate) and the second abrasive is any abrasive having a Mohs index of less than 3.0. This abrasive is not calcite. In preferred compositions, the second abrasive is kaolin, talc, gypsum, bentonite, hectorite, montmorillonite, muscovite, phlogopite, pyrophyllite or vermiculite. A particularly preferred second abrasive is kaolin. Thus, in a preferred embodiment of the composition, the abrasive system consists of a first abrasive material, which is calcite, and a second abrasive material, which is kaolin.

The cream composition may additionally contain 5-20 wt.% Abrasive material with a Mohs index in the range of 3.5-5.0. These include dolomite, feldspar, silica, alumina, amalgam, anatase, apatite, boron carbide, corundum (natural alumina), cristolone, sepion, diopside, emery, enamel, enstatite, fluorite, garnet, glass beads, hematite , kyanite, magnetite, olivine, orthoclase, petalite, porcelain, feldspatoids, pyrite, pumice, quartz, quartz sand, silicon carbide, spinel, spodumene, staurolite, topaz, titanium dioxide, tungsten carbide, zirconium silicate, zirconium dioxide, zeolites in the form particles, silicates, other carbonates, silicon oxides, bicarbonates, bo mates, sulfates, and polymeric materials such as polyethylene.

However, the presence of such abrasive materials is not necessary, but only preferred, in order to obtain additional abrasive action. It has been found that compositions having a higher pH value, i.e. pH in the range of 8-11, but free from the disclosed abrasive system, are not so suitable for removing grease and are not considered mild. On the other hand, compositions with a neutral to moderately acidic pH, containing a significant amount of solid abrasive material with a Mohs index of 3.5-5, are non-rigid, but not very suitable for removing grease.

Not wishing to be bound by theory, it is fashionable to believe that an abrasive system having a first abrasive material (calcite) and a second abrasive material other than calcite, having a Mohs index of less than 3.0, act synergistically and provide a more efficient removal of grease by approximately 70- 90% In addition, since each abrasive material is a moderate abrasive material, their combined effect, although generally expected to be moderate, obviously unexpectedly provides significant removal of grease contamination. Therefore, it is believed that the ability of calcite to remove crusty grease is increased by a second abrasive material with a Mohs index of less than 3.0. This effect is also not observed in compositions containing calcite and dolomite (Mohs index 3.5, harder abrasive material), but free from the second abrasive material, as disclosed in the description.

In preferred compositions, the average particle size of each abrasive material is 0.5-400 microns, more preferably 10-200 microns.

In preferred compositions, the mass ratio of the first abrasive material (calcite) to the second abrasive material is from 1: 0.15 to 1: 6, in more preferred compositions it is from 1: 0.5 to 1: 3.

The viscosity of such cream compositions is in the range of 600-1200 cP. Viscosity can be measured using any known means / technique. Preferably, the viscosity is measured using an Ex series controlled disturbance rheometer. TA Instruments AR 1000. The geometry of a parallel flat plate having a diameter of 4 cm is used. The gap between the plate and the base is set to 1000 μm. Data is analyzed using TA data analysis software. A sample of the paste is placed on the base and the plate is placed in the gap of a given geometry. Viscosity is measured at shear rates in the range of 10-25 s ^-1 and recorded at 20 s ^-1 .

The pH of the compositions is in the range of 6-7.5, more preferably 6-7. The pH value is measured at 25 ° C on a clean (undiluted) sample.

Water.

The paste / cream composition further comprises 20-60 wt.% Water, preferably 30-65 wt.% And more preferably 40-65 wt.%.

Optional ingredients.

The composition may accordingly contain other ingredients that increase the cleaning efficiency. For example, the composition may contain components such as citrates, dicarboxylic acids, water-soluble phosphates, especially polyphosphates, mixtures of ortho and pyrophosphates, zeolites, sodium carbonate, sodium silicate, disodium silicate, sodium metasilicate and mixtures thereof. Such components can additionally act as abrasive materials if they are present in an amount in excess of their solubility in water. In addition to the above ingredients, various other optional ingredients, such as structurants, colorants, suspending agents for contaminants, washing enzymes, perfumes and preservatives, may be included as appropriate

- 4 031869 effects with their known positive effects.

According to a second aspect, the use of a cream composition of the first aspect is disclosed for removing deposits of crusty oily or greasy contaminants from a hard surface.

In accordance with a third aspect, a method is disclosed for removing crusty oily or greasy contaminants remaining on a hard surface, a method having the steps of applying the composition of the first aspect to it, cleaning the contaminated part with a hard brush or cloth and wiping with a damp cloth.

The composition is evenly distributed over the cleaned hard surface and cleaned with a stiff brush or cloth. Then the surface is washed or wiped with a paper towel / cloth until completely dry.

The invention will now be illustrated using the following non-limiting examples.

Examples.

Example 1. Preparation of a control composition.

The premix is obtained by mixing 5 g of technical sodium carbonate in 92 g of demineralized water at a temperature of 50 ° C. To this mixture was added 32 g of LAS acid (linear alkylbenzenesulfonic acid, (Reliance Industries, India)) and the contents were further stirred for 5 minutes to neutralize. The completion of the reaction is confirmed by checking the pH of the mixture, and a pH of 8 or more indicates complete neutralization. To this neutralized mass, 5 g of methyl laurate is added and mixed, then 18 g of C12-3EO of a nonionic surfactant are added. Stirring is continued for another 2 minutes. This premix is stored in a thermostat at a temperature of 50 ° C.

In a separate vessel, 0.06 g of an antifoam silicone emulsion is mixed with 358 g of demineralized water at a temperature of 50 ° C. To this aqueous mixture was added 35 g of sodium carbonate and stirred, followed by 450 g of calcite. To this mixture was added 153 g of the premix described previously, stirring was continued for 5 minutes. The compositions were allowed to cool for 1 hour. Other ingredients, such as colorants and perfumes, were then added to the composition.

Example 2. Preparation of a preferred cream composition.

The premix is obtained by mixing 10 g of dolomite with 91 g of demineralized water at a temperature of 50 ° C. To it was added 32 g of LAS acid (as described above) and was further stirred for 5 minutes to achieve complete neutralization. The completion of the reaction is confirmed by the achievement of the pH of the mixture in the range of 6-7.5. To this neutralized mass is added 5 g of methyl laurate and further mixed, followed by the addition and mixing of 17 g of a nonionic surfactant (as described above). This premix (245 g) is stored in a thermostat at a temperature of 50 ° C.

In a separate vessel, 22 g of calcite is mixed with 400 g of demineralized water at a temperature of 50 ° C, followed by the addition of 130 g of kaolin and stirring for 2 minutes. 243 g of the above premix are added to this mixture and further mixed for 2 minutes. This cream composition was allowed to cool for 1 h, and then other minor ingredients, such as colorants and perfumes, were added to the composition.

The preparation of the sample, covered with a crust of contamination, and the method of cleaning the composition described above, are tested on a steel tile (hard surface) on which castor oil is applied. Oil (0.05-0.07 g) is applied to a stainless steel tile (pre-weighed) using a pipette. The oil is distributed on a plate that remains horizontal at room temperature for 12 hours to allow the oil to form a continuous, even film. The tiles are then placed in a thermostat for one hour at 100 ° C. The tiles are removed, allowed to cool for 1 h and weighed again to know the exact weight of the crusted oily / greasy contamination.

A contaminated tile is placed in a sample holder of a testing machine (ETM). Cotton fabric is fixed in the working part of the ETM. The set weight is fixed on the working part and the machine is started to work with a fixed speed. The tile is then removed from the machine, washed under running water and then with demineralized water, and then dried in an oven at 50 ° C. for about 30 minutes. The tile is weighed. % contamination removal is calculated using the weight difference.

Several control compositions and compositions of the present invention are obtained according to the procedure described previously, with suitable modifications.

Details of all such compositions and purification data are presented in the table.

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Ingredient May. % / Control composition May. %. / Compositions according to the invention 1 2 3 1 2 3 4 5 Water 46.0 46.0 49.0 49.0 49.0 49.0 49.0 49.0 Do-LAS * - - 3.2 3.2 3.2 3.2 3.2 3.2 Na-LAS * 3.2 3.2 - - - - - - Dolomite (clean) - 9.0 9.7 9.7 9.7 9.7 9.7 9.7 Sodium carbonate 4.0 4.0 - - - - - - Nonionic surfactant 1.8 1.8 1.7 1.7 1.7 1.7 1.7 1.7 Calcite 45.0 22.0 35 30,0 22.0 17.5 13.0 5,0 Kaolin - 13.0 - 5,0 13.0 17.5 22.0 30,0 Fragrance, dye, methyl laurate, antifoam and other small additives 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 pH 10.5 10.5 6.5 6.5 6.5 6.5 6.5 6.5 Removal of fat contamination /% 69 62 60 79 90 84 80 73 The ratio of calcite to kaolin NA 1: 1.69 NA 1: 0.16 1: 0.59 1: 1 1: 1.69 1: 6

Note.

Do-LAS refers to a mixture of calcium and magnesium salts of linear alkylbenzenesulfonic acid obtained by neutralizing linear alkylbenzenesulfonic acid with a stoichiometric excess of dolomite, thereby leaving a significant amount of unreacted (free) dolomite for abrasive action.

Na-LAS is a sodium salt of alkylbenzenesulfonic acid obtained by the usual neutralization reaction.

The table contains a set of control compositions and a set of compositions in accordance with the invention.

Although Control-1 provides significant removal of fat contamination, it is aggressive to the skin due to its high pH. Even the inclusion of an abrasive system (calcite and kaolin) and the further addition of dolomite (as in control-2) does not improve the rate of removal of fat contamination. The composition of control-3 is significantly lower, presumably due to the lack of a second abrasive material.

Each composition in accordance with the invention, i.e. 1-5, provides a more significant removal of fatty contaminants than any of the control compositions, and especially compositions 2, 3 and 4, which have a ratio in the range from 1: 0.5 to 1: 3, provide a very high degree of removal of fatty contaminants with significantly lower pH.

The examples shown clearly show how the need for cleaning compositions in the form of a paste or cream with a neutral or slightly acidic pH and having the optimal content and type of abrasive material is met. The compositions are highly effective against crusty oily / greasy contaminants on a hard surface.

Claims (10)

1. A cream composition for cleaning hard surfaces, comprising (i) 0.5-15 wt.% Anionic surfactant, at least 90 parts of which are a mixture of calcium and magnesium salts of linear alkylbenzenesulfonic acid; (ii) 10-50% by weight of an abrasive system comprising a first abrasive material which is calcite and a second abrasive material other than calcite having a Mohs index of less than 3.0, wherein the mass ratio of said first to said second abrasive material is from 1: 0.15 to 1: 6 and the pH of the specified composition, measured at 25 ° C, is in the range of 6-7.5. 2. The composition according to claim 1, in which the specified mass ratio is from 1: 0.5 to 1: 3. 3. The composition according to claim 1 or 2, wherein said second abrasive material is kaolin, talc, gypsum, bentonite, hectorite, montmorillonite, muscovite, phlogopite, pyrophyllite or vermiculite. 4. The composition according to claim 3, in which the specified second abrasive material is kaolin. 5. The composition according to any one of claims 1 to 4, in which the anionic surfactant is obtained by neutralizing a linear alkylbenzenesulfonic acid with a dolomite group mineral. 6. The composition according to claim 5, in which the mineral is dolomite. 7. The composition according to any one of claims 1 to 6, which further comprises 0.5-5 wt.% Non-ionic surfactants. 8. The composition according to any one of claims 1 to 7, which further comprises 5-20 wt.% Abrasive ma - 6 031869 terials with the Mohs index 3.5-5.0. 9. The use of a cream composition according to claim 1 for removing crusty oily or greasy contaminants from a solid surface. 10. A method of removing crusty oily or greasy contaminants from a solid surface, which includes the steps of applying to the surface of the composition of claim 1, cleaning the contaminated part with a hard brush or cloth and wiping with a damp cloth. Eurasian Patent Organization, EAPO Russia, 109012, Moscow, Maly Cherkassky per., 2