I did this to my blush brush...no wonder my cheeks break out so much!! GO DO THIS RIGHT NOW! You will be amazed at how clean and soft and nice-smelling your brushes will be. Make-up brush diy cleaner: 1 cup warm water + 1 TBSP vinegar + 1 TBSP dish soap. Swirl swirl swirl. Rinse. Reshape and dry overnight!
Tutorial on how & why to properly clean your makeup brushes. (a tablespoon of white vinegar in a cup of hot water, and a 20 minute soak, followed by a hot, then cold rinse and pat dry will do it. Disinfects, dissolves grease/makeup, leaves no film, and inexpensive.)