This one's non-negotiable! Cleansing oil, mousse, milk or lotion? Doesn't matter - the important thing is that you cleanse, even if you're not wearing make up. Cleansing doesn't just remove make up, but also gets rid of grime stuck to our skin. It's the only sure-fire way to deal with impurities, excess sebum and pollution accumulated throughout the day. Plus it gets our skin ready to soak up the active ingredients in our night creams.