How to make liquid soap: A detailed step-by-step guide ...
1/4 cup castile soap bar ( (grated, and tightly packed) 1 tablespoon washing soda (use a little more for thicker soap) 1/4 cup liquid castile soap; 10-30 drops of essential oil (optional) Process. Add grated castile soap to boiling water and stir until dissolved. Add washing soda and stir. Add liquid castile soap …