If you don´t have a special brush cleanser, here are some useful tips:

• Run the brush under warm water
• Use a mild shampoo
  
• Lather up
  
• You might want to clean Blush Brushes, Foundation Brushes and Concealer Brushes extra thoroughly
• Rinse under warm water and make sure there is no more lather
• Use a dry towel to dry the brush
  
• Dab the bristle on the towel gently
• Be careful not to change the natural shape of the bristle
• Let the brushes dry while laying down horizontal on a dry towel. We don´t want any water in the ferrule
• Rotate the brush after a few hours if needed
• For best result, let the brush dry over night

Good Luck!