Urgent! What is "non-detergent soap"? - Google Groups
Feb 25, 2000·It means real soap: bar soap, saddle soap, etc. They are made from fats treated with lye, and any excess soap not washed off will combine with the oils in the waterproffing to make a grease. Detergents, on the other hand, if not thoroughly rinsen, may prevent the waterproofing from taking hold.
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