Dermatologists, beauty editors, and celebrities alike swear by the Clarisonic cleansing brush ($199). We had a chance to talk to Clarisonic cofounder Dr. Robb Akridge and discovered something horrifying . . . we’ve been missing some crucial steps in our daily Clarisonic routine! Sure, we know how to clean it, but these tips will help you get the most out of your favorite skin-care device.