The two last decades have been marked by an increasing environmental awareness. In relationship to detergents, renew-ability, biodegradability, and ecotoxicity have become important issues in the study, development and application of surfactants. In this respect, rapeseed methyl ester ethoxylates are an interesting new class of nonionic surfactants that gain more and more interest on the market. They are easily to formulate into attractive liquid detergents with high cleaning performance and show a more favorable ecotoxicological profile compared to fatty alcohol ethoxylates.