Cleaning makeup brush rolls can be quite challenging and frustrating. MakeupByRenRen teaches us an easy and quick technique on how she cleans her sigma makeup brush rolls. Things you will need: an oil-based facial cleanser or a regular olive oil and paper towel. Grab a paper towel and damp it with your oil-based facial cleanser or regular olive oil. Gently rub the paper towel on the surface of your dirty makeup brush rolls. Make sure that you go in every direction to effectively remove all the makeup smudges. Repeat the application until there is no trace of makeup left on your brush rolls. This technique will help you maintain a nice, shiny, almost brand-new makeup brush rolls!