Your makeup brushes will last longer if you take care of them. Wash the brush hair or bristles with warm water and mild soap after use. If the strands are very greasy, use baby shampoo to help clean them. Do not drip water onto the base of your makeup brush. To clean the base, use a cloth to wipe it off with a mild soap. Do not wipe the base vigorously because it may break if the water goes deep into where the glue is stuck to.