Skin care is an enigma to a lot of people. Unless you’re Kylie Jenner and can afford to try a new, top-shelf product every two weeks to determine your skin’s exact needs, it can be a lifelong game of trial and error. Which cleansers work for you, how often should you exfoliate, what vitamins could your skin use an extra dose of? Some truths are universal: Everyone should wash their face daily, for example, for simple hygiene. And while some things are still up in the air, like how the jury’s still out on whether or not you should wash your face with a cleanser after working out (some say no, because a little sweat is good for you skin, and others say yes, because gross), there are other ideas floating around out there that have been thoroughly debunked over and over again.