HOW TO CLEAN: Simply get a bar of soap and rub brush against bar of soap under warm running water until clean. Dry with an old flannel / towel. We recommeHOW TO CLEAN: Simply get a bar of soap and rub brush against bar of soap under warm running water until clean. Dry with an old flannel / towel. We recommend cleaning once a week to ensure hygienic SPF application everyday.nd cleaning once a week to ensure hygienic SPF application everyday.