Double Cleansing is cleansing the skin twice, first with an oil-based cleanser, then with a water- or surfactant-based cleanser. The Dermalogica Double Cleanse - aka the secret to healthy, ultra-clean skin - easily removes layers of built-up make-up, products and oily debris, allowing your prescribed Dermalogica Cleanse to penetrate even further, for a professional level of clean.
why you need to double cleanse
Whether or not you wash your face day and night, you might be surprised at what's left on your skin after a single cleanse.
Environmental pollutants in the air, as well as cosmetics such as sunblock and waterproof make-up, combine daily with the skin's naturally-sticky sebum (oil) secretions to form a thick, slick, waxy coating by the middle of the day. Yuck.
If you're like most people, you only spend about 20 seconds cleansing with standard face washes or make-up removal wipes. That's not enough to penetrate those layers of debris. You're left with excess sebum, make-up, pollutants and grime that give your skin a dull, congested apearance and prevent your skin care from doing its best work. Cleansing twice with the same cleanser won't do the trick, either.
As chemistry tells us, "like attracts like," which is why Dermalogica developed a Double Cleanse technique that involves first cleansing with an oil-based formula that can deconstruct and dissolve layers of oily buildup for a deeper clean than a cleanser alone.
here's how it works 
Step One: PreCleanse Balm
Massage our original PreCleanse oil into the skin to attract and thoroughly dissolve excess buildup.
Step Two: Cleanser
Wash your face with your prescribed Dermalogica Cleanser to remove any residual impurities.
The result? A thorough clean that sets you up for your healthiest-looking skin, daily.