11 Things You Should Never Do With Castile Soap - Migredients
3. Mix It With Oxygen Bleach. Oxygen bleach is a mixture of hydrogen peroxide and washing soda. Mixing oxygen bleach and Castile soap will have the same effect as mixing hydrogen peroxide and Castile soap. That is, the result will be not as effective as the alkaline nature of castile soap will neutralize the peroxide in the oxygen bleach.