“I’ve been washing my own personal brushes every other day or so,” Boyd said. “Remember, your brushes will only remain clean if you have clean hands too, so keep up on the handwashing, especially before sitting down to do your makeup.”
Boyd recommends using “gentle but effective soaps” to clean brush bristles, specifically those from Dr. Bronner’s and Beautyblender. That being said, brush handles should also be cleaned as a precaution.
“For liquid and cream products, bar soaps often work best,” Boyd said. “In a pinch, try dipping a brush into some olive oil first to help break down the product, but still follow with soap and water.”