We recommend washing make-up brushes periodically. Residual cosmetic products will take away from the soft suppleness of a make-up brush’s performance. It may even cause the hairs to break. Da Vinci brush soaps are specially developed to protect and even recondition the natural hairs. These soaps are based on pure vegetable oils which will improve performance by helping the hairs retain their robust elasticity. Your quality brushes will last for a very long time.