Run the synthetic bristles of the brush under warm running water.(Do Not Use Hot Water as It may damage the cosmetic Brushes)^ Apply a small amount of gentle facial cleanser or brush cleaner to the synthetic bristles and work into a light lather.^ Rinse the bristles thoroughly under running water. You will notice that the water leaving the brush is tinted from old makeup.^ Continue rinsing until no color remains on the brush.^ Allow the brush to air-dry.