Therefore it is essential to understand what a bleach bath is and the pros and cons of using this method. Bleach Bath Hair Pros and Consīleach baths serve a specific purpose. If you chose to do other commonly used chemical procedures for that, you’d damage your hair severely. The main advantage of this technique is being able to change or fix the tones of your hair, without damaging the hair fibers. It will clean off the “old” color so that your hair can receive the new one. When using Bleach Bath for the latter goal, in practice, this technique will do a gentle but deep cleansing of the old, unwanted pigments. It can lighten your hair up to 2 tones, depending on how long you leave it on the hair. Also known as Soap Cap, it can be used to repair bleach or dye mistakes. The Bleach Wash is simply a hair-lightening technique which is less aggressive because it’s done only with shampoo, hydrogen peroxide and bleach powder.