WO2010084057A1

WO2010084057A1 - Hand dishwashing agent having antibacterial effect

Info

Publication number: WO2010084057A1
Application number: PCT/EP2010/050294
Authority: WO
Inventors: Georg Meine; Heinz-Dieter Soldanski; Detlef Buisker; Frank Sonnenschein
Original assignee: Henkel Ag & Co. Kgaa
Priority date: 2009-01-22
Filing date: 2010-01-12
Publication date: 2010-07-29
Also published as: DE102009005791A1

Abstract

The invention relates to a cleaning agent for hard surfaces, in particular a hand dishwashing agent, having a surfactant combination made of a nonionic surfactant and an amine oxide and elemental silver and/or a silver compound. The cleaning agents have an antibacterial effect in concentrated and diluted form.

Description

"Hand dishwashing detergent with antibacterial effect"

The invention relates to cleaning compositions for hard surfaces, in particular hand dishwashing detergents, comprising a surfactant combination and silver and / or a silver compound.

In a kitchen, pathogenic bacteria - especially after processing eggs, raw meat and raw fish - on work surfaces and kitchen appliances, such as cutting boards, but also in the cleaning utensils used, such as moist rinse sponges, cloths or brushes, multiply and thus one pose a serious danger. Another focus of bacteria is the sink and especially the drain, in which the spent rinse water is.

Conventional dishwashing detergents can usually not effect sufficient growth inhibition or even germ killing even with concentrated use.

Antibacterial dishwashing detergents are already known from the prior art which contain, for example, triclosan (2,4,4'-trichloro-2'-hydroxydiphenyl ether) or essential oils, such as thymol, menthol or eucalyptol, as the bacteriostatic component. The applications WO 99/57235 A1 and WO 99/29815 A1 disclose antibacterial dishwashing agents which contain carboxylic acids, such as, for example, benzoic acid.

In many products today silver or silver compounds are used with the aim to suppress unpleasant odors and / or kill germs. In particular, silver salts are suitable for achieving these effects.

However, silver salts, especially in the presence of reducing ingredients, tend to reduce so that ingredients such as sugar compounds, aldehydes and other ingredients in these products may be dispensed with.

Hand dishwashing detergents usually comprise a surfactant combination of a fatty alcohol ether sulfate, an alkyl polyglucoside and a betaine or a surfactant combination of an alkylbenzenesulfonate, a fatty alcohol ether sulfate and a betaine or a surfactant combination of an alkylbenzenesulfonate, a fatty alcohol ether sulfate and an alkylpolyglucoside.

In particular, the sulfonate and sulfate surfactants tend to react with the silver ions to precipitate sparingly soluble brown-black silver sulfide.

In addition, the foam produced by dishwashing detergent with these surfactant combinations is very stable and leads to a long-lasting film formation in the sink and in the siphon system. This increases the contact time of the bacteria from the used rinsing liquor the sink and siphon system, which can lead to the development of unpleasant odors.

It was therefore an object of this invention to provide an antibacterial hard surface cleaner, especially a hand dishwashing detergent, which is stable and has little or no residual foam problem.

This object is achieved by a cleaning agent for hard surfaces, in particular a hand dishwashing detergent, comprising

(a) a surfactant combination of a nonionic surfactant and an amine oxide and

(b) elemental silver and / or a silver compound.

It has surprisingly been found that this particular combination of surfactants together with silver and / or a silver compound leads to a storage-stable hard surface cleaning agent which has an antibacterial effect in concentrated but also dilute application. Furthermore, the detergent produces a lesser amount of foam, which, however, meets consumer expectations. The same applies to the stability of the foam produced. The foam formed quickly disintegrates as the used rinse liquor drains off, thereby reducing the foam residue in the sink and siphon.

It is preferred that the silver compound is selected from the group consisting of silver acetate, silver citrate, silver diamine chloride complex, silver cyclodextrin complex, silver dicyanokalium complex, silver phthalimide, silver phenylcyanamide, silver (ethylene thiourea) complex, silver imidazolate, transition metal NHC-calixarene complexes , Silver crown ether, silver nitrate and mixtures thereof. The liquid washing, cleaning, after-treatment or washing aid particularly preferably contains silver nitrate.

These silver compounds have sufficiently high solubility and are not precipitated by the hard surface cleaners.

It is further preferred that the amount of elemental silver and / or the silver compound is from 0.0001 to 1% by weight, based on the total cleaning agent.

Furthermore, it is preferred that the nonionic surfactant is selected from the group consisting of alkoxylated fatty alcohols, alkoxylated fatty acid alkyl esters, Polyhydroxyfettsäureamiden, Alkylphenolpolyglycolethern, alkyl glucosides and mixtures thereof.

These nonionic surfactants in combination with an amine oxide have good cleaning performance on grease-soiled hard surfaces such as dishes. The invention also relates to the use of elemental silver and / or a silver compound as an antibacterial component in a hard surface cleaner, especially a hand dishwashing detergent, with a surfactant combination of a nonionic surfactant and an amine oxide.

The invention further relates to a process for antibacterial cleaning of hard surfaces by diluting a hard surface cleaner, in particular a hand dishwashing detergent, comprising (a) a surfactant combination of a nonionic surfactant and an amine oxide, and silver and / or a silver compound with water to concentrations of 1: 1 to 1: 1000 and bring into contact the hard surface to be cleaned with the obtained cleaning solution.

In the following, the invention will be explained in more detail, inter alia, by way of examples.

The hard surface cleaner contains a surfactant combination of a nonionic surfactant and an amine oxide.

Suitable nonionic surfactants include alkoxylated fatty alcohols, alkoxylated fatty acid alkyl esters, polyhydroxy fatty acid amides, alkylphenol polyglycol ethers, alkylglucosides, and mixtures thereof.

The nonionic surfactants used are preferably alkoxylated, advantageously ethoxylated, in particular primary, alcohols having preferably 8 to 18 carbon atoms and on average 1 to 12 moles of ethylene oxide (EO) per mole of alcohol, in which the alcohol radical can be linear or preferably methyl-branched in the 2-position or linear and methyl-branched radicals in the mixture can contain, as they are usually present in Oxoalkoholresten. In particular, however, alcohol ethoxylates with linear radicals of alcohols of native origin having 12 to 18 carbon atoms, for example of coconut, palm, tallow or oleyl alcohol, and on average 2 to 8 EO per mole of alcohol are preferred. Preferred ethoxylated alcohols include, for example, _C12 - ₁₄ - alcohols containing 3 EO, 4 EO or 7 EO, C ₉ n-alcohol with 7 EO, C-ms alcohols containing 3 EO, 5 EO, 7 EO or 8 EO , C ₁₂ -i ₈ -alcohols with 3 EO, 5 EO or 7 EO and mixtures of these, such as mixtures of C ₁₂ -i ₄ -alcohol with 3 EO and C ₁₂ -i ₈ -alcohol with 7 EO. The degrees of ethoxylation given represent statistical means which, for a particular product, may be an integer or a fractional number. Preferred alcohol ethoxylates have a narrow homolog distribution (narrow rank ethoxylates, NRE). In addition to these nonionic surfactants, fatty alcohols with more than 12 EO can also be used. Examples of these are tallow fatty alcohol with 14 EO, 25 EO, 30 EO or 40 EO. Nonionic surfactants containing EO and PO groups together in the molecule can also be used according to the invention. Especially preferably, the cleaning agent for hard surfaces containing a C ₂ -i ₈ fatty alcohol with 7 EO, or _C13. _5-i -oxo alcohol with 7 EO as non-ionic surfactant.

In addition, non-ionic surfactants alkylglucosides of the general formula RO (G) _x can be used in which R is a primary straight-chain or methyl-branched, especially in the 2-position methyl-branched aliphatic radical having 8 to 22, preferably 12 to 18 carbon atoms, and G is the symbol representing a glucose unit having 5 or 6 C atoms, preferably glucose. The degree of oligomerization x, which indicates the distribution of monoglucosides and oligoglucosides, is any number between 1 and 10; preferably x is 1, 2 to 1, 4. Alkyl glucosides are known, mild and skin-friendly surfactants.

The content of nonionic surfactants in the cleaning agent is preferably 1 to 30% by weight and preferably 2 to 25% by weight, in each case based on the total cleaning agent.

Suitable amine oxides include, for example, alkylamine oxides, especially alkyldimethylamine oxides, alkylamidoamine oxides and alkoxyalkylamine oxides. Preferred amine oxides satisfy formula II,

R ⁶ R ⁷ R ⁸ N ⁺ -O ^" (II)

R ⁶ - [CO-NH- _(CH2) _W] _Z -N ⁺ (R ⁷⁾ (R ⁸⁾ -O ^'(II) in which R ⁶ is a saturated or unsaturated C _{_6-22} -alkyl radical, preferably C ₈ -i ₈ -alkyl radical, preferably a saturated C ₁₀ -i ₆ alkyl radical, for example a saturated C _t2 - _U - alkyl radical in the alkylamidoamine oxides over a carbonylamidoalkylene -CO-NH- (CH ₂₎ _Z - and, in the alkoxyalkyl via an oxyalkylene group - O- (CH ₂ ) _Z - is bonded to the nitrogen atom N, where z is in each case a number from 1 to 10, preferably 2 to 5, in particular 3,

R ^7, R, ^8, independently, a CI_ ₄ alkyl optionally hydroxysubstituted such as a hydroxyethyl group, in particular a methyl radical.

Examples of suitable amine oxides are the following compounds designated as INCI: almond amidopropylamine oxides, babassuamidopropylamine oxides, behenamine oxides, cocamidopropyl amine oxides, cocamidopropylamine oxides, cocamine oxides, coco-morpholine oxides, decylamine oxides, decyltetradecylamines oxides, diaminopyrimidines oxides, dihydroxyethyl C8-10 Alkoxypropylamines oxides, dihydroxyethyl C9-11 alkoxypropylamines oxides, dihydroxyethyl C12-15 alkoxypropylamines oxides, dihydroxyethyl cocamine oxides, dihydroxyethyl lauramine oxides, dihydroxyethyl stearamines oxides, dihydroxyethyl tallowamine oxides, hydrogenated palm kernel amines oxides, hydrogenated tallowamine oxides, hydroxyethyl hydroxypropyl C12 -15 alkoxypropylamines oxides, isostearamidopropylamine oxides, isostearamidopropyl morpholine oxides, lauramidopropylamine oxides, lauramine oxides, methyl morpholine oxides, milkamidopropyl amine oxides, minkamidopropylamine oxides, myristamidopropylamine oxides, myristamine oxides, myristyl / cetyl amine e oxides, oleamidopropylamine oxides, oleamine oxides, olivamidopropylamine oxides, Palmitamidopropyl Amines Oxide, Palmitamine Oxide, PEG-3 Lauramine Oxide, Potassium Dihydroxyethyl Cocamine Oxide Phosphate, Potassium Trisphosphonomethylamine Oxide, Sesamidopropylamine Oxide, Soyamidopropylamine Oxide, Stearamidopropylamine Oxide, Stearamine Oxide, Tallowamidopropylamine Oxide, Tallowamine Oxide, Undecylenamidopropylamine Oxide and Wheat Germamidopropylamine Oxide.

Preferred amine oxides are, for example, N-cocoalkyl-N, N-dimethylannin oxide, N-tallowalkyl-N, N-dihydroxyethylamine oxide, myristylcetyldimethylamine oxide or lauryldimethylamine oxide.

The content of amine oxide in the cleaning agent is preferably 1 to 15% by weight and preferably 2 to 10% by weight, in each case based on the total cleaning agent.

As an essential ingredient, the hard surface cleaner contains elemental silver and / or a silver compound.

According to the invention, silver is used either in elemental form or in the form of its compounds. If the silver used in elemental form, it preferably has particle sizes of 0.1 to 100 microns. Even finer particle sizes of silver can be achieved by using the elemental silver in colloidal form, wherein the silver has particle sizes of 0.001 to 0.1 microns.

However, it is preferred that the agent contains a silver compound and that silver compound is selected from the group consisting of silver acetate, silver citrate, silver diamine chloride complex, silver cyclodextrin complex, silver dicyanokalium complex, silver phthalimide, silver phenylcyanamide, silver (ethylene thiourea) complex, silver imidazolate, Transition metal NHC-calixarene complexes, silver crown ethers, silver nitrate, and mixtures thereof. The silver compounds are preferably used in the form of solutions, suspensions or dispersions. The cleaning agent particularly preferably contains silver nitrate, which is used in the form of an aqueous solution.

The amount of elemental silver and / or silver compound is preferably from 0.0001 to 1 wt%, and more preferably from 0.001 to 0.25 wt%, based on the total hard surface cleaner. Very particularly preferred cleaning agents contain 0.01 to 0.1 wt .-% of elemental silver and / or a silver compound, based on the total cleaning agent.

In addition, the agent, in particular for improving cleaning action, flow behavior and / or drying behavior, additionally contain one or more amphoteric surfactants and / or cationic surfactants. Amphoteric surfactants (amphoteric surfactants, zwitterionic surfactants) which may be further included in the compositions include alkylamidoalkylamines, alkyl substituted amino acids, acylated amino acids and biosurfactants, respectively.

The composition may additionally contain one or more cationic surfactants (cationic surfactants, INCI quaternary ammonium compounds), usually in an amount of 0.001 to 5% by weight.

Preferred cationic surfactants are the quaternary surface-active compounds, in particular having an ammonium, sulfonium, phosphonium, iodonium or arsonium group. Through the use of quaternary surface-active compounds with antimicrobial action, the antimicrobial effect already present by the elemental silver and / or the silver compound can be improved. Suitable QACs are for example benzalkonium chloride, benzoxonium chloride, benzetonium chloride or dialkyldimethylammonium chlorides such as di-n-decyl-dimethyl-ammonium chloride.

The cleaning agent is preferably aqueous, in particular an aqueous hand dishwashing detergent. In addition to water, it may advantageously additionally contain one or more water-soluble organic solvents, usually in an amount of 0 to 15 wt .-%, preferably 0.1 to 10 wt .-%, in particular 3 to 8 wt .-%.

The solvent is used as needed in particular as a hydrotrope and viscosity regulator. It acts solubilizing in particular for surfactants and electrolyte as well as perfume and dye, if present, and thus contributes to their incorporation, prevents the formation of liquid-crystalline phases and has a share in the formation of clear products. The viscosity of the agent according to the invention decreases with increasing amount of solvent.

Preferably, the solvent is selected from the group consisting of methanol, ethanol, propanol, isopropanol, ethylene glycol, butyl glycol, propylene glycol, polypropylene glycols, and mixtures thereof. More preferably, the hard surface cleaner contains ethanol as a solvent.

The agent may further contain hydrotropes. These are Löslichkeitsvemittler. Suitable hydrotropes are, for example, urea, butyl glycol or aliphatic short-chain anionic or amphoteric solubilizers.

The viscosity which is favorable for the agent is 20 ^° C. and a shear rate of 30 min ^-1 - measured with a Brookfield LV DV II viscometer and spindle 31 - in the range from 5 to 1500 nnPa · s, preferably 10 to 1200 mPa · s , in particular 20 to 1000 mPa s. To adjust the viscosity, the agent may further contain one or more water-soluble salts as electrolytes. These may be inorganic and / or organic salts.

To further improve the running and / or drying behavior, the agent may contain one or more additives from the group of polymers and builders, usually in an amount of 0.001 to 5 wt .-%.

In addition, one or more further - and in particular in hand dishwashing detergents and hard surface cleaners - conventional auxiliaries and additives, in particular UV stabilizers, perfume, pearlescing agents, dyes, corrosion inhibitors, preservatives, disinfectants, enzymes, pH adjusters and skin feel-improving or nourishing additives in amounts of usually not more than 5 wt .-% be contained.

The pH of the composition can be adjusted by means of customary pH regulators, for example acids such as mineral acids or citric acid, benzoic acid and / or alkalis such as sodium or potassium hydroxide, wherein - in particular with the desired hand compatibility - a range from 4 to 9, preferably 5 to 8, in particular 5.5 to 7.5, is preferred.

For adjustment and / or stabilization of the pH, the agent may contain one or more buffer substances.

When using benzoic acid, salicylic acid or lactic acid as pH regulators and / or buffer substances, these compounds can support or enhance the antibacterial action of the silver and / or the silver compound.

To clean a hard surface, the cleaning agent according to the invention is applied either directly, that is undiluted, for example by means of a sponge, to the surface to be cleaned and then removed again with water.

Alternatively, the cleaning agent according to the invention can first be diluted with water to concentrations of 1: 1 to 1: 1000, and then the resulting cleaning solution is brought into contact with the surface to be cleaned.

In both cases, an antibacterial cleaning of the hard surface occurs in which the number of germs and bacteria present is significantly reduced in the actual cleaning process, as compared to a detergent without added antibacterial agent. EXAMPLES

Table 1 shows the compositions of two comparative formulations V1 and V2 and the compositions of a hard surface cleaning agent E1 according to the invention (all amounts are in% by weight of active compound, based on the agent):

Table 1

V1 V2 E1

Ci ₃ -i ₅ -oxo-alcohol with 7 EO - - 12

N-cocoalkyl-N, N-dimethylamine oxide - 8

AgNO ₃ - - 0.017

Sec. C ₁₄ - "i ₇ -alkanesulfonate, Na-SaIz 5 5 -

Sodium lauryl ether sulphate 2EO 20 20 -

Cocosamidopropyl betaine 5 5 1, 61

Salicylic acid - 0.3 -

Water Ad 100 Ad 100 Ad 100 pH 6.0 4 7.1

Of all three agents, the olfactory odor factor (OFG) was determined.

In a first test, in each case a sponge was pressed 10 times for 2 minutes in a 35 ⁰ C warm rinse (4 ml detergent V1, V2 or E1 to 5 liters of water). The water of the rinse liquor had a hardness of 16 dH. In addition, the rinse liquor contained 10 g of an artificial dirt (IKW test dirt No. 2, rich in fat).

In a second test, 6 ml of the cleaning agents V1, V2 and E1 were each placed on a sponge.

The thus pretreated sponges were each stored for 48 hours in a thin-layer chromatography chamber of glass with a neutral atmosphere and then assessed by 10 test persons with respect to the odor (grade 1 = neutral odor, grade 10 = strong natural bad smell). The results are shown in Table 2.

Table 2

V1 V2 E1

OFG TEST 1 7 7 5 OFG TEST 2 6 4 2.5 The determination of the olfactory odor factor (OFG) clearly shows that with the cleaning agent E1 according to the invention not only with concentrated use of the cleaning agent (TEST 2) the formation of unpleasant odors caused by bacteria can be reduced, but also with dilute use (TEST 1 ).

Table 3 shows the compositions of seven hard surface cleaners according to the invention, E2 to E8 (all amounts are in% by weight of active, based on the agent):

Table 3

E2 E3 E4 E5

Ci ₃ -i ₅ -oxo-alcohol with 7 EO 10 8 4 2

N-cocoalkyl-N, N-dimethylamine oxide 2 4 8 10

AgNO ₃ 0.017 0.017 0.017 0.017

Water Ad 100 Ad 100 Ad 100 Ad 100 pH 6.8 6.9 7 7

Foam volume [ml] 210 210 276 306

Table 3 (continued)

E6 E7 E8

Ci ₃ -i ₅ -oxoalcohol with 7 EO 24 16 16

N-cocoalkyl-N, N-dimethylamine oxide 8 4 2

AgNO ₃ 0.017 0.017 0.017

Water Ad 100 Ad 100 Ad 100 pH 7.1 7.1 7

Foam volume [ml] 289 205 210

All cleaners E2 to E8 according to the invention were clear and stable even after 10 weeks of storage. In the cleaning agents E2 to E8 also other ingredients, such as in particular dyes and / or perfume and / or ethanol, could be incorporated easily. The cleaning agents thus obtained also showed no change in appearance after 10 weeks of storage.

To determine the foam volume, a SITA Foam Tester R-2000 was used. This uses a rotor of defined geometry for the generation of foam, which introduces mechanical air bubbles into the liquid. The foam volume is measured by a needle sensor, which scans the foam surface and allows an exact determination of the foam volume even with uneven foam surface. The measurement conditions were as follows: Quantity of product solution: 250 ml, dosage: 1, 2 g / l, water hardness 16 ° d, number of revolutions: 2000rpm, temperature of

Product solution 4O ⁰ C.

The measurement was carried out after the product solution was foamed 6 times for 10 seconds.

Conventional hand dishwashing detergents containing a surfactant combination of a fatty alcohol ether sulfate, an alkyl polyglucoside and a betaine or a surfactant combination of an alkyl benzene sulfonate, a fatty alcohol ether sulfate and a betaine or a surfactant combination of an alkyl benzene sulfonate, a fatty alcohol ether sulfate and an alkyl polyglucoside produce foam volumes in the range of 400 to 700 ml The quantities of foam produced according to the invention of the cleaning agents E2 to E8 are lower than in the case of conventional dishwashing agents, so that the residual foam problem is thereby reduced. The amounts of foam produced meet consumer expectations for a hand dishwashing detergent.

The rinsing power of the cleaning agents according to the invention was determined in a semi-automatic plate test apparatus using a fatty Mischanschmutzung. It was at a constant temperature of 40 to 45 ⁰ C in 5 l of water hardness 16 ° under constant conditions compared to the hand dishwashing detergent V1 soiled with test soil dish rinsed until the foam formed before the start of the experiment was destroyed. The concentration was 3 ml per 5 liters of water.

Although the cleaning agents E2 to E8 according to the invention had a lower, but still sufficiently high flushing power in comparison to the cleaning agent V1.

It is also possible to provide rinse aid for the automatic cleaning of dishes with an antibacterial effect.

Table 4 shows the composition of a rinse aid E9 according to the invention and a rinse aid V3 not according to the invention for use in a dishwashing machine.

Table 4

E9 V3

C _{_2-15} oxo alcohol with EO / PO 14 14 *

N-cocoalkyl-N, N-dimethylamine oxide 2 2

Citric acid x 1 H ₂ O 3 3

AgNO ₃ 0.02 -

Perfume, dye + +

Water Ad 100 Ad 100

OFG 1, 5 4.5

Genapol® EP 2564 (ex Clariant) To determine the olfactory odor factor was washed in commercially available dishwashers average dirty dishes and cutlery at 45 ⁰ C with the addition of a detergent (Somat® ex handle) and rinse aid E9 or V3. After completing the wash program, the machines remained loaded. After 2 days, the smell in the interior was evaluated by a panel of 12 trained participants (grade 1 = neutral odor, grade 10 = strong natural bad smell). The results clearly show that the silver-containing rinse aid composition has been evaluated better and reduces the formation of bad odor more.

By means of a disinfectant test (phase 2 / stage 1 test) according to DIN / EN 1276, the antibacterial effect of a hand dishwashing detergent E10 according to the invention was determined.

Table 5 shows the composition of the hand dishwashing detergent E10 according to the invention which has been subjected to this test.

Table 5

E10

C ₁₂ -i ₆ -alkyl polyglucoside (PG = 1, 4) * 3.2

N-cocoalkyl-N, N-dimethylamine oxide 12,8

Citric acid x 1 H ₂ O 1, 27

AgNO ₃ 0.017

H ₂ O ₂ 0.1

Water Ad 100 pH 5.8

* APG® 600 from Cognis; PG stands for degree of polymerization

Under the conditions tested (concentration of the agent 80% (v / v), contact time: 5 minutes, temperature: 20 ^° C. and incubation time: 16 h) the hand dishwashing detergent E10 produced clean (addition of 0.03% by weight bovine serum albumin). and contaminated (addition of 0.3 wt .-% bovine serum albumin) conditions a reduction of the bacterial count of the tested strains Staphylococcus aureus, Pseudomonas aeruginosa, Escheria coli and Enterococcus hirae by at least a factor of 10 ⁵ .

Claims

claims

1. Cleaning agents for hard surfaces, in particular hand dishwashing detergents, comprising

(a) a surfactant combination of a nonionic surfactant and an amine oxide, and

(b) elemental silver and / or a silver compound.

A hard surface cleaner according to claim 1, characterized in that said silver compound is selected from the group consisting of silver acetate, silver citrate, silver diamine chloride complex, silver cyclodextrin complex, silver dicyanokalium complex, silver phthalimide, silver phenylcyanamide, silver (ethylene thiourea) complex, Silver imidazolate, transition metal NHC-calixarene complexes, silver crown ethers, silver nitrate, and mixtures thereof.

A hard surface cleaner according to claim 1 or claim 2, wherein the amount of elemental silver and / or silver compound is 0.0001 to 1% by weight based on hard surface cleaner.

A hard surface cleaner according to any one of claims 1 to 3, characterized in that the nonionic surfactant is selected from the group consisting of alkoxylated fatty alcohols, alkoxylated fatty acid alkyl esters, polyhydroxy fatty acid amides, alkylphenol polyglycol ethers, alkyl glucosides and mixtures thereof.

5. Use of silver and / or a silver compound as an antibacterial component in a hard surface cleaner, in particular a hand dishwashing detergent, with a surfactant combination of a nonionic surfactant and an amine oxide.

A process for antibacterial cleaning of hard surfaces by diluting a hard surface cleaner, in particular hand dishwashing detergent

(a) a surfactant combination of a nonionic surfactant and an amine oxide, and

(B) silver and / or a silver compound with water to concentrations of 1: 1 to 1: 1000 and contacting the hard surface to be cleaned with the resulting cleaning solution.