The present invention comprises (a) a mixture of the following (a1) and (a2) 28 to 80% by weight, (a1) 5 to 50% by weight of N-methyl-N-C8-C10-acylglucamine, (a2 50) to 95% by weight of N-methyl-N-C12-C14-acylglucamine, wherein the sum of components (a1) and (a2) is 100% by weight, (b) one or more 0 to 20% by weight of alcohol, (c) 20 to 72% by weight of water, (d) 0 to 5% by weight of additives, wherein components (a), (b), (c) and (d) The total relates to the surfactant solution, which is 100% by weight.
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