Abstract: The removal of oily soil from textile fibres which have been treated with organosiloxanes, e.g. for improved handle or crease recovery, is facilitated if the fibres are also treated with an organosilane of the general formulaY.sub.3 SiRN.sup.+ (R").sub.2 R'X.sup.-in which Y is hydrocarbon, alkoxy or alkoxyalkoxy, at least one Y being alkoxy or alkoxyalkoxy, R represents a divalent hydrocarbon or hydrocarbonoxy group, R' represents a monovalent hydrocarbon group or an alkyleneoxy or polyalkyleneoxy group, each R" represents methyl or ethyl and X represents a halogen atom.