Double cleansing is using an oil-based cleanser first followed by a water-based cleanser.
It’s hard to fully remove SPF and makeup with just one cleanse. Most of the time, tiny bits of those dirt particles are left behind and cause breakouts! Double cleansing removes those particles with the oil based cleanser, and then washing them off with the water based cleanser!
Think of this as a formula:
Oil cleanser (removes makeup) + Water cleanser (removes dirt and sweat) = Superb clean!