Exfoliate as often as your skin can tolerate it, recommends Dr. Murad, to get rid of oil, dirt and dead skin cells, and help your skin-care products to penetrate more easily. He likens the process to cleaning your floors. The more frequently you do it, the less often you’ll have to hire a professional to do the job for you. A few times a week, try to use a hydroxy-acid wash or a light mechanical exfoliant. A few times a year, go for a professional facial or microdermabrasion treatment.