Hair treatment agent comprising polyalkoxy alkyl amino-substituted siloxanes

A hair treatment agent which includes, in each case based on its weight,

• a) 0.1 to 20% by weight of at least one silicone including groups of formula (I)
• in which
• n stands for values from 1 to 1000,
• A stands for a group
• in which R1 stands for —H or —CH3 and R stands for a straight-chain or branched alkyl moiety including 8 to 24 C atoms, and a stands for an integer from 1 to 20;
• b) 0.1 to 20% by weight of at least one copolymer including monomer units of formulas (V) and (VI)
• in which R2 stands for —H or —CH3 and X stands for H, an alkali metal cation, or a straight-chain or branched alkyl moiety including 1 to 24 C atoms;
• c) 0.5 to 5% by weight of 2-phenylbenzimidazole-5-sulfonic acid.