Easy! You will need a few supplies from your local Beauty Supply: A White Block Buffer with a 240 grit, a 3-way buffer and a good quality Base Coat. Remove the polish and buff the nails lightly with the white block buffer to remove the stain, but ONLY the stain - do not file too deeply. Buff the nails with the 3-way buffer, first using the black side, then the white, then the gray. Doing this will help to seal the nail plate so the pigment in the polish will not be absorbed by the nail plate layers. Apply your base coat, two THIN coats of color adn follow with a good quality top coat.