The present invention provides a linear, cyclic or branched polyether-functional siloxane or a mixture of polyether-functional siloxanes of the general formula (I) R[—O(3-h)/2Si(R1)(OR)h]x[—O(3-i-j)/2Si(R2)(R3)i(OR)j]y, (II) in which groups R are identical or different and R is essentially H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-methoxyethyl or 2-hydroxyethyl or, in the case of cyclic siloxanes, may be a silyl radical of the silyl units of the formula (I), groups R1 are identical or different and R1 is a terminally blocked polyether group of the formula (II), R4—O[—R5—O]n[(—R6)m]— (II) and groups R2 are identical or different and R2 is a linear, branched or cyclic, optionally substituted alkyl group having 1 to 18 carbon atoms or a mercaptoalkyl group or an alkenyl group having 2 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms or an aryl group having 6 to 12 carbon atoms or an aminoalkyl group or the general formula (III) H2N(CH2)d[(NH)e(CH2)f]g—(CH2)3— (III) The present invention further provides aqueous and/or alcoholic compositions which comprise a polyether siloxane according to formula (I), to methods for the production of said systems, and to the use thereof.