BoatCandy Hull Cleaner (Waterline Stain, Scum & Rust Remover) BoatCandy Hull Cleaner is formulated to instantly remove waterline stains, scum, and rust from boat hulls—quickly and easily. Its professional-strength formula is designed to dissolve grime without heavy scrubbing, won’t damage the surface being cleaned, and is an ideal prep step before hull polishing. It is listed as safe for use on most fiberglass and painted surfaces. Key Benefits Targets waterline stains, scum, and rust. Professional-strength formula designed to dissolve grime without heavy scrubbing. Designed to not damage the surface being cleaned (when used as directed). Ideal preparation before polishing the hull. Listed as safe for most fiberglass and painted surfaces. How to Use (Directions) Shake well. Apply Hull Cleaner with a sponge, brush, or sprayer to the dirty area. Dwell time: Let the product sit for 2 minutes. Rinse with fresh water. Repeat if needed: Heavily soiled or stained surfaces may require a second application. Use only as directed. Warnings & Best Practices Protective gloves recommended while using this product. Do not use on galvanized metals. The manufacturer states they are not responsible for damage caused by incorrect application. Specifications Brand / Line BoatCandy (Car Candy) Product Hull Cleaner (NEW) Manufacturer SKU (Car Candy listing) 30-00606 APS SKU (provided) 30-00744-1-2 Removes Waterline stains, scum, rust Listed Safe Surfaces Most fiberglass and painted surfaces Application Tools Sponge, brush, sprayer Dwell Time 2 minutes Do Not Use On Galvanized metals Available Sizes (Car Candy listing) 1 Gallon, 1 Quart Ideal For Removing waterline stains and black scum buildup on boat hulls. Cleaning rust staining on listed safe marine surfaces before hull polishing.