1. An aqueous-based cleaning preparation comprising 1 to 60% of one or more surfactants chosen from anionic and/or nonionic and/or amphoteric and/or cationic surfactants, with the exception of esterquats, characterized in that the cleaning preparation comprises 0.001 - 15% of mixture of sterol and ethoxylated sterol. 2. The cleaning preparation as claimed in claim 1, characterized in that cleaning preparation comprises 0 - 5% of one or more conditioning agents, 0 - 5% of one or more stabilizers, 0 - 3% of one or more preservatives, 0 - 5% of one or more thickeners, and 0 - 20% of active ingredients, 0 - 1% of dyes and 0 - 5% of one or more opacifiers or pearlizing agents. 3. The cleaning preparation as claimed in claim 1 or 2, characterized in that it is a shower preparation, a foam bath composition or a shampoo. 4. The cleaning preparation as claimed in claim 1 or 3, characterized in that one or more phytosterols are present as sterol. 5. The cleaning preparation as claimed in claim 1 or 4, characterized in that an ethoxylated sterol having a degree of ethoxylation of 5 - 30 (EO) is present as sterol. 6. The cleaning preparation as claimed in claims 1 to 5, characterized in that the proportion of ethoxylated sterol is greater than or equal to the proportion of nonethoxylated sterol. 7. The cleaning preparation as claimed in any of claims 1 to 6, characterized in that a mixture of anionic and amphoteric or anionic and nonionic surfactants is present. 8. The cleaning preparation as claimed in any of claims 1 to 7, characterized in that the anionic surfactant is chosen from an alkyl sulfate, alkyl ether sulfate, sulfosuccinate, sulfosuccinamate, sarcosinate, isothionate, tauride, ether carboxylic acid, protein fatty acid condensate, alkylsulfonate and alkylbenzenesulfonate, monoalkyl phosphate, monoglyceride sulfate, amide ether sulfate, alkyl sulfoacetate, .alpha.olefinsulfonate, the amphoteric surfactant is chosen from alkylaminopropionates, alkyl-, alkylamido-, sulfobetaines, alkyl glycinates and the nonionic surfactant is chosen from alkanolamides, fatty acid ethoxylates, fatty alcohol ethoxylates, alkyl polyglucosides, amine oxides, sorbitan esters, alkylphenol oxethylates, mixed condensates of ethylene oxide and propylene oxide. 9. The cleaning preparation as claimed in any of claims 1 to 8, characterized in that it comprises - 25% of surfactant. 10. The cleaning preparation as claimed in any of claims 1 to 9, characterized in that it has 0.5 to 5% of sterol and/or ethoxylated sterol. 11. The cleaning preparation as claimed in any of claims 1 to 10, characterized in that 0.01 - 5% of lecithin, phosphatidylcholine, sphingolipid and/or ceramide are present. 12. A process for the preparation of a cleaning preparation as claimed in any of claims 1 to 11, characterized in that a solution of water and surfactants is prepared, heated to the melting temperature of the sterol(s), said sterols are melted therein, then the mixture is stirred until cold and then, as necessary, further additives, auxiliaries and active ingredients are incorporated at temperatures of from 60 degree C to 25 degree C. 13. The use of cleaning preparations as claimed in any of claims 1 to 11 as washing gels, shower preparations, foam baths or shampoos.