The present invention relates to washing or cleaning agents having improved foaming characteristics under high soil loading, containing at least one anionic surfactant and at least one alkylamidopropyl betaine of formula (R1)C(═O)NH(CH2)3N+(R2)(R3)CH2COO−, where R1 is an alkyl radical having 7 to 9 carbon atoms and R2 and R3 are identical or different alkyl radicals having 1 to 3 carbon atoms, wherein the weight ratio of the alkylamidopropyl betaine defined herein/total amount of anionic surfactant in the washing or cleaning agent is from 0.003 to 0.12, wherein the weight ratio of the total amount of alkylamidopropyl betaine as defined herein/total amount of alkylamidopropyl betaine in the washing or cleaning agent is 0.25 to 1.0, to washing or cleaning methods in which washing or cleaning agents of this kind are used.