Sudbury Boat Zoap Plus is a heavy duty liquid marine cleaner that works like powders without the abrasive effect associated with powdered cleaners. Double-action emulsification removes scum, smudge, oil and grease. Ideal for fiberglass, Boat Zoap Plus is safe for cleaning all finishes, including gelcoat surfaces. Not for use on sails or fabrics. 100% biodegradeable earth-friendly formula.