Hi Loves I have very sensitive skin and because of this I break out easily. I don't usually have acne unless its that wonderful time of the month lol or I don't take proper measures to keep everything that touches my face clean. Like sanitizing my hands and keeping my brushes clean. Once a week I deep clean my brushes but I spot clean them every day. This is how.
You will need :
Just put the rubbing alcohol on a cotton pad then rub the brush over the cotton pad and see the product build up come off. I usually flip over the cotton pad and repeat or use a second one. Works great for foundation and eye liner/eye brow brushes best because of their shape. Just change up your technique depending on the brush you are cleaning. I clean my flat top brushes by rubbing them on the cotton in a circular motion and my eye brushes by rubbing them back and forth. You can also fill a small dish with rubbing alcohol and and swirl the whole brush inside for a deeper clean. Its very easy and the best part the rubbing alcohol evaporates fast so your brushes dry quickly.
Sorry for the picture quality I haven't gone to the store yet for batteries so I'm using my old Camera today.