alcohol. Use it on a cotton ball, or paper towel...you will probably have to scrub a bit..but it will work. Also, when your dying your hair, always look every where. Look on your arms, legs, feet, floor, and right after your done...take a wash cloth and wipe around the back of your neck, all around your ears, and around the lining of the front of your hair. ;) Hope this helps. works for me every time.