marketed in the form of 50 to 90 by weight solutions in alcohol which may readily be diluted as required with water quaternized fatty acid imidazolines are also known cationic surfactants which are normally obtained by condensation of fatty acids with diamines preferably ethylenediamines and subsequent quaternization with alkyl halides or dialkyl sulfates processes for producing the imidazolines and their quaternization products are known for example from german references de a1 40 20 271 de a1 40 38 983 and de a1 41 16 648 henkel the imidazolines may also contain open chain hydrolysis products however they normally correspond to the following formula in which r 8 is an alkyl and or alkenyl group containing 7 to 21 carbon atoms and preferably 11 to 17 carbon atoms r 9 represents optionally hydroxysubstituted alkyl groups containing 1 to 4 carbon atoms or a benzyl group r 10 represents hydroxysubstituted alkyl groups containing 2 to 4 carbon atoms or a ch 2 ch 2 nhcor 8 group and x stands for halide or alkyl sulfate in one particular embodiment of the invention products derived from oleic acid or from a fatty aced cut predominantly containing oleic acid are used quaternized fatty acid imidazolines obtained by condensation of oleic acid with diethylenetriamine or aminoethyl ethanolamine and subsequent quaternization with dimethyl sulfate or methyl chloride are particularly preferred the ratio by weight of component a to component b in the textile finishes according to the invention may be from 90 10 to 10 90 and is preferably from 15.