Water has always been the most accessible and natural cleanser, and there's no doubt that there's a place for it in your beauty routine. But, simply put, on its own it isn't enough. Oil and water don't mix, so water alone just can't handle the greasy elements of pollution, sebum and traces of makeup: you need a proper cleanser.
Makeup removers and cleansing products are specifically designed to cope with oily cosmetics without upsetting the skin's natural balance or damaging the lipid barrier.
What's more... in many areas, tap water contains high levels of lime - the stuff that furs up your kettle - which may irritate sensitive complexions or make the skin feel tight and strained.