Dirty brushes hold oils and bacteria because the bristles are porous. Your makeup will be difficult to apply and blend and your makeup will be spotty.
Keeping brushes clean will keep your skin clear, allow you to apply makeup smoothly, and extend the life of the brushes.
I recommend using a gentle cleanser, that will dissolve oil, wax, and power.
YOUR FACIAL CLEANSER OR MILD DISH SOAP ARE GREAT OPTIONS FOR CLEANING YOUR BRUSHES.