i only use one makeup brush daily and it's a eyeliner brush for fluidline from mac. since it's gel eyeliner i use, i do a "quick cleaning" with mac brush cleanser everytime after i use it. with face brushes, i'd "quick clean" everytime after i use it or every other day. for mac brush cleanser, it's $12 for a really big bottle that lasts a long time and you can use it on any kind of brushes. and every one or two weeks, i'll deep clean all my brush with water and baby shampoo. it's important to deep clean your brushes because you don't want a build up of bacteria.