Cleaning makeup brushes is a necessity. Each time you use a makeup brush, it picks up both makeup and any natural oils on your face, as well as any other products that are on your face. Then there is the dust in the air that just lands on a resting brush. Bacteria can make a home in dirty makeup brushes, so this buildup must be removed on a regular basis. MakeupGeek shows us here how to do it like a Pro.