Baby Shampoo. Alcohol. It's that simple.
Even if its just because there is product buildup on your brushes, you want to clean your makeup brushes often. The more often you clean and take care of them, the longer they will last.
If you are using your brushes everyday, they should be cleaned at least weekly. If you are using one brush for multiple products and/or colors, it should be cleaned after each use.
I feel that most people don’t clean their brushes because "they don’t have time." Well, it’s time to make time, because what you are putting on your skin from those dirty brushes, is rather icky.
Not only are the brushes applying the makeup, but it’s brushing around any bacteria and/or dirt that is on your skin. Especially those face powder brushes that you apply a few times a day – I'm sure you’re not washing your face right before each of those touch-ups.
Clean gently with baby shampoo and then lay flat with brush part hanging off a ledge (off a counter or sink). I also recommend using alcohol, at least every other time. Apply a little bit of alcohol on a wash cloth and brush away other bacteria and dirt.
You don’t have to spend a fortune on name-brand brush cleaners – stop making that one of your excuses on why you aren’t cleaning them! Believe me, you will notice a huge difference in the application of your makeup with clean brushes - and your skin will thank you!