Many people use makeup brushes and sponges to apply cosmetics each day. With every application, your brushes and sponges collect oil, dust, dead skin, and residual makeup. If not regularly and properly cleaned, these tools can re-deposit these less-than-pleasant substances back on your face, clogging your pores. Sanitizing and cleaning your beauty tools can reduce the transmission of excess bacteria onto your face and prevent breakouts. The QC Makeup Academy, a school for professional makeup artists, has published a helpful guide on how to clean and sanitize your makeup brush, sponges, and all kinds of beauty essentials.