How to Make Castile Soap (with Pictures) - wikiHow- xà phòng sri llankan castile ,May 10, 2011·How to Make Castile Soap. Castile soap is a biodegradable soap made with olive oil, water and lye. It was invented in Aleppo and brought, by the crusaders, to the Castile region of Spain where it became popular. For centuries people have...How to Make Castile Soap (with Pictures) - wikiHowMay 10, 2011·How to Make Castile Soap. Castile soap is a biodegradable soap made with olive oil, water and lye. It was invented in Aleppo and brought, by the crusaders, to the Castile region of Spain where it became popular. For centuries people have...