You should wash your brushes once a week to them clean and bacteria free. The easiest way is to use a mild soap or shampoo. I usually use a coffee cup. Put some warm water with the soap and swirl each brush in the cup. Then take a clean cup with warm water and again swirl the brushes around and repeat this process until the water is completely clear. Gently squeeze excess water out and lay on edge of the counter with brushes hanging off the edge so that one side of your brushes doesn’t end up flat.