When to Clean Makeup Brushes

You should wash all brushes that you use on a regular basis at least once a week if you use them less often then once a day you can go a couple weeks without washing them. I do mine about once a month depending on how often I actually use them since I don't do makeup that often. When washing your brushes you should use a mild shampoo (baby shampoo works best) then roll the brush in your hands till it lathers then rinse under luke warm water. Rinse well until the water runs clear (you will notice all the makeup tinting the water when you first start rinsing the brush). Reshape the bristles and lay the brush horizontal to dry (like on the counter) with the bristles hanging over the edge to dry.
If you want to you can wipe the brushes off with baby wipes daily to prevent makeup build up then throughly wash them every month. Over washing can wear out your brushes faster and cause the glue to wear away causing the bristles to fall out.
Don't use any product that contains alcohol/peroxide/saylicylic acid those will all dry out the bristles and make them dry and brittle.