Use of a compound with the formula (1) ** Formula ** in the cleaning of surfaces, in particular of medical devices, food packaging or hygiene articles, where A) only 1 radical R1, R2, R3 or R4 is a organic radical of the general formula - (C (D) (E)) hX or - (C (D) (E)) k-aryl- (C (D) (E)) lX, where h is an integer of 1 to 20 and k, l are each independently an integer from 0 to 6, where D and E are each independent of the other hydrogen, halogen, hydroxyl, OR (VIII), where R (VIII) is methyl, ethyl , ethyl, n-propyl, n-butyl, phenyl, or benzyl, OC (= O) -R (IX) where R (IX) is hydrogen, methyl, ethyl, n-propyl, n-butyl, phenyl, or benzyl, or thiol, and where X is an organic radical having only one quaternary nitrogen atom and aryl is a substituted or unsubstituted aromatic or a substituted or unsubstituted heteroaromatic that does not contain a nitrogen atom, and where the radicals R1, R2, R3 or R4 that are not - (C (D) (E)) hX or - (C (D) (E)) k -aryl- (C (D) (E)) lX can be, each independently of the other, identical or different and are hydrogen, halogen, hydroxyl, thiol, nitro, carboxylate, aldehyde having 1 to 20 carbon atoms, ketone having 2 to 20 carbon atoms, O-alkyl having 1 to 20 carbon atoms, S-alkyl having 1 to 20 carbon atoms, O-alkenyl having 2 to 20 carbon atoms, S-alkenyl having 2 to 20 carbon atoms, O-aryl having 5 to 20 carbon atoms, S-aryl having 5 to 20 carbon atoms, ether having 2 to 20 carbon atoms, thioether having 2 to 20 carbon atoms, carboxylic acid ester having 1 to 20 carbon atoms, carboxamide having 1 to 20 carbon atoms, thioester having 1 to 20 carbon atoms, alkyl having from 1 to 20 carbon atoms, alkenyl having from 2 to 20 carbon atoms, cycloalkyl having from 3 to 20 carbon atoms, cycloalkenyl having d e 3 to 20 carbon atoms, aryl having 5 to 20 carbon atoms or heteroaryl having 4 to 20 carbon atoms, which do not contain N atoms, and where each of the radicals R5 or R6, independently one on the other, it is identical or different from
