The invention relates to a surfactant solution containing (a) 28 to 80 wt.- % of a mixture of (a1) 5 to 20 wt.- % of N -methyl N-Cs- Cio- acylglucamines ,- (a2) 50 to 95 wt.- % of N -methyl- N- Cn- Cw- acylglucamines , components (a1) and (a2) adding up to 100 wt.- % (b) 0 to 20 wt.- % of one or more alcohols (c) 20 to 72 wt.- % of water , and (d) 0 to 5 wt.- % of additives, components (a) , (b) , (c) and (d) adding up to 100 wt.- %.
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