Double cleansing gets rid of "grime that sits on top of your skin," along with makeup, excess oil, and dead skin. The process involves washing your face using two products: an oil-based cleanser followed by a water-based cleanser. The first step draws out oil-based impurities such as sebum, SPF, makeup, and pollutants while the second step cleanses water-based debris such as sweat and dirt. It can also improve the efficacy of your other skincare products. Your pores are clean and better prepared to draw in your serum.