GENERAL BOAT CARE CRP-INDICATOR: CLEAN DISCRIPTION DULON HULL & WATERLINE CLEAN 22 is a powerful cleansing agent for cleaning the hull and waterline of the ship. It removes effectively brownish/yellow deposits, superficial rust spots and scales. No need to scrub due to the self-purification property. MANUAL Apply DULON HULL & WATERLINE CLEAN 22 to the hull or waterline by sponge or soft brush. Allow 10 minutes to take effect (prevent dehydration) before rinsing off with water. In case of severe pollution rehearse the treatment.