XPS Eco-friendly Hull Cleaner is a formula that removes tough waterline stains without requiring heavy scrubbing Removes tough hull and waterline stains from scum, algae, rust and more while being gentle on the environment Deep cleaning formula dissolves grime without heavy scrubbing and is safe for fiberglass, gel coat, and painted surfaces of your hull. This is a factory original equipment item, not an aftermarket XPS Eco-friendly Hull Cleaner is a formula that removes tough waterline stains without requiring heavy scrubbing. Removes tough hull and waterline stains from scum, algae, rust and more while being gentle on the environment. Deep cleaning formula dissolves grime without heavy scrubbing and is safe for fiberglass, gel coat, and painted surfaces of your hull.