Ever feel like you have zombie nails after removing a dark colored nail polish? Dark colored nail polishes can leave a nasty stain on your nails that most people cover up with more dark nail polish, which just makes it worse. but that doesn't mean you have to give up dark colored nail polish for good. To get rid of that nasty discoloring, soak your feet in apple vinegar and scrub them with a clean tooth brush and some tooth paste. This will lighten up any unsightly stains and make your nails look brighter. this can also be done with your finger nails. I suggest that you buy a separate tooth brush to use on your nails, and not to use the same one you brush your teeth with.