A washing agent, preferably a liquid washing agent, which contains at least one amine oxide together with at least one sugar surfactant. For example, at least one glucamide, preferably a fatty acid-N-alkyl glucamide, and/or at least one alkyl polyglycoside, having improved cleaning performance, in particular against fat-containing stains. The invention also relates to methods for washing textiles using the described washing agents and to the uses thereof.