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cationic surfactants of the present invention are also understood to mean cationic compounds of the following general structure: R here stands for a substituted or unsubstituted, branched or straight-chain alkyl or alkenyl radical having 11 to 35 carbon atoms in the chain X is - O - or - NR 5 - R 1 represents an alkylene group having 2 to 6 C atoms, which may be unsubstituted or substituted, in which case substitution with an -OH or -NH group is preferred in the case of a substitution, R 2 , R 3 and R 4 each independently represent an alkyl or hydroxyalkyl group radicals according to the invention are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, Pentyl iso-pentyl, neo-pentyl, hexyl, iso-hexyl, hydroxyalkyl, dihydroxyalkyl, hydroxyethyl, R5 is hydrogen or a C1 to C6 straight-chain or branched, alkyl or alkenyl radical which may also be substituted by a hydroxyl group, especially methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, iso-pentyl, neo-pentyl, hexyl, iso-hexyl, hydroxyethyl, hydroxypropyl, dihydroxypropyl, hydroxybutyl, dihydroxybutyl, trihydroxybutyl, trihydroxypropyl, dihydroxyethyl and a " represents a halide such as fluoride, chloride or bromide, an alkyl sulfate such as a methosulfate or ethosulfate, a phosphate, a citrate, tartrate, maleate or fumarate the teaching of the invention also includes the recognition that mixtures of at least two cationic surfactants can be used