These brushes should be washed with soap and very hot water. Work the soap into the hairs and make sure you rinse well, then squeeze the hairs between a towel. I like to use a bar of Camay or a natural soap. Do not rub the brush on the towel. You should rinse in water that is almost too hot to touch. Do not leave the brushes sitting in water. Immediately squeeze the water out and leave to dry naturally.