The present invention relates to a detergent, preferably a liquid detergent, containing a surfactant system, which comprises: a) 15 to 50% by weight, based on the surfactant system, of at least one surfactant of the formula: R1-CH(SO3-X+)-C(═O)OCH3; and/or b) 15 to 50% by weight of at least one surfactant of the formula: R2-C(═O)O—(AO)n-CH3, wherein R1, R2, AO, n and X+ are defined as disclosed here. The invention further relates to washing processes which use said detergents and to the use of the surfactant system described here for improving the cleaning power of a detergent.
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