Use acetone nail polish remover to clean away stickers and sticky residue from sunglasses. Use nail polish remover sparingly on plastic glasses because prolonged exposure may dull the protective finish or coating on the plastic. Apply acetone nail polish remover to the sticker so the remover saturates the sticker's surface. Use a fingernail or blunt object to carefully scrape the sticker from the sunglasses. Apply the remover to a cotton ball and clean away any residue. Acetone nail polish remover works well on metal too, but if there is a painted finish, test the remover on an inconspicuous part of the sunglasses first to ensure the paint won't be removed.