It is highly advisable to clean your brush after every use; it is best to use anti-bacterial hand soap for this process. Most individuals tend to find anti-bacterial soap sacrilegious on their brushes. However, it is vital when it comes to sanitizing your makeup brush.
In addition to anti-bacterial soap, you might consider using shampoo, vegetable soap, or dish soap. To clean your brushes, you will have to take a drop of soap and then roll the bristle in it and then run it under lukewarm water. You should roll your brush bristles on your hand during the process. Moreover, it would help if you considered keeping the water running until the color fades. Once that is done, blot off excess water and then lay it to dry. This process works wonderfully.
It would be best if you then considered cleaning the brush every time you use it. By doing so, you will be improving your brush’s cleanliness, preventing bacteria from colonizing it. You might, however, consider cleaning your blush and eye shadow brushes weekly.