You should always remember to clean your makeup brushes. You do not want two-week old makeup sitting in a makeup brush on your face because that is bad. It can also cause breakouts. This also works with beauty blenders.
Step 1: Gather your makeup brushes
Step 2: Get some dish detergent. I like to use gain detergent because it is denser and more efficient.
Step 3: Pour some of the detergent on your makeup brushes. A little goes a long way so you do not have to put on a lot.
Step 4: Massage and rub the brush bristles with the detergent. You will see the old makeup in your brush foam up. It just means that the detergent is doing its job.
Step 5: Rinse with warm water. You should then have a perfectly clean makeup brush