My friend Beth came over today for craft day and I finally asked her for her makeup brush cleaner recipe. In theory you are supposed to wash your makeup brushes every week. Beth actually does. It's really easy and keeps your brush and therefore your face very clean.
1 tbsp dish soap
1 tbsp vinegar
1 cup very hot water (boiling even)
Mix everything together and toss in your brushes. Let them sit for a few minutes, then swish them around. Rinse with cool water and blot them dry with a paper towel. Lay them out on an elevated surface (you don't want your bigger brushes to get smooshed) and let them dry.