Starbrite - Ultimate Magic Sponge - 18-Pack - 41018. The fastest way to remove stains, scuffs and streaks from fiberglass and vinyl surfaces.. Features:. 18-Pack. For home, auto, Rv, boat & more. Instantly erases dirt, grime, scuff marks and streaks. Removes scuffs and stains from vinyl, plastic and fiberglass. Ideal for walls, appliances, baseboards, showers, tubs and tiles. Directions:. Lightly dampen sponge and squeeze out excess water. Gently scrub stains or scuff marks. Rinse or wipe cleaned area.