If you don’t already, you absolutely must wash your makeup brushes bi-weekly if not weekly. I found a great homemade solution that does the trick every time. I put my makeup brushes upside down in a glass or cup with a few drops of dish soap, some steaming hot water and about a table spoon or 2 of white vinegar. I swish the brushes around for a few seconds and then let them soak for a couple minutes. I bring them to the sink and continue swishing them and rinsing them with hot water. They come out squeaky clean. In addition always lay your brushes flat on a hand towel to make sure they fully dry out before using them again.