How to make liquid castile soap (uses potassium hydroxide lye) -
Easy, Beginner DIY Liquid Castile Soap Recipe - Oh, The Things We'll Make!
How to Make Liquid Castile Soap (with Pictures) - wikiHow
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12 DIY Cleaning & Personal Care Products You Can Make Out of Liquid Castile Soap « The Secret Yumiverse :: WonderHowTo