Instant Hull Cleaner - Gel Formula (32 fl. oz.)

32 fl. oz. New gel formula "sticks" where applied for maximum cling time and cleaning power. Naturally powerful oxalic acid formula, more user-friendly than harsher hydrochloric or phosphoric acid formulas. Specifically formulated to remove the toughest stains, including rust, dried fish blood, and leaf stains. Works on all fiberglass and painted surfaces; ideal for vertical surfaces.