Washing your makeup brushes and sponges after every use might seem like a time suck, but the difference it makes not only in your skin, but how your makeup applies is huge. Even if you wash your brushes once a week, you’re still using “dirty” brushes for the majority of the week and they only get dirtier as the week progresses. Dirty brushes harbor old makeup, bacteria, and other pore-clogging crap, so if you’re committed to clearing up your acne, clean your brushes!
I always try to keep a few brush kits handy to easily rotate through during the week to minimize the amount of times I wash my brushes. I always wash my brushes with Dawn dish soap to cut through any oils and built up product, and I lay them flat to dry on the radiator at night. In the morning, I have squeaky clean brushes to use!