why not use UV light and keep it under a uv bulb/lamp
+1It's hair, so all you need is shampoo or dish soap if you feel a need to clean them. I've never done vinegar. The key to maintaining badger brushes is rinsing them thoroughly so they don't build up a residue. I rinse mine under running water for some time. I then soak them in clean water while I finish my post shave routine, then rinse them under running water again. With this procedure I've never had to clean a brush with shampoo, dish soap or anything else.