2. Use a specialized brush cleaning tool: A deep-cleaning mitt like SIGMA BEAUTY 2X Sigma Spa® Brush Cleaning Glove has two specially textured sides, one for face-makeup brushes and the other for eye-makeup brushes, to thoroughly remove all traces of residue and buildup. There are also tons of silicone brush cleaning mats on Amazon. Customer Review: "I have been using this foundation brush for quite some time now and just recently bought a new one when the first one went missing and later found. I have foundation brushes from other high end cosmetic companies but, really, nothing compares to this. These days I primarily use tinted moisturizers as foundation and this brush makes everything come out so smooth and beautiful. The brush head is so soft but also because the bristles are so tightly packed that it provides the perfect balance to apply product. Also love the short handle which give so much control." mdash Nordstrom