The Best Makeup Brush Cleaner Ever. – I was in search of an innovative way to clean makeup brushes, that even by using department store brush cleaner, won’t come clean. I found this recipe on Pinterest, but I didn’t have tea tree oil, so I changed it around a bit. It makes your makeup brushes look brand new in seconds! Just swirl brush around in the cup with mixed ingredients. Rinse with hot, then cold water, pat dry excess water & let dry brush side up in a cup.