How effective would a stain be on this surface? The same is true for our skin. Active ingredients in serums, moisturizers and creams can penetrate deeper and work better if they are applied to a clean surface. Cleansing your face is an important step in any regiment for healthy skin, as it will not only remove dirt, but will also help keep your skin's barrier function in tact. Over the course of the day, our skin accumulates not only sebum (the skin's own protective and lubricating oils), but also dirt, pollution, and don't forget that layer of makeup you put on. It is essential to loosen up this debris with a good cleanser and then wash it off with water before applying penetrating products that will help rejuvenate and regenerate your skin, or deal with issues such as acne or pigmentation.