Designed especially for RV and marine toilets, Aqua Foam toilet cleaner penetrates and removes grime in seconds without scrubbing. Foaming action works in very little water, so the solution allows effortless cleaning - just pour it in, and rinse later. Safe for plastic, porcelain, seals, and other components. Leaves behind a fresh scent. Includes three 2-oz. packets. Requires very little water for foaming action Safe for plastic, porcelain, seals, & more | Thetford Aqua-Foam Toilet Cleaner