GENERAL BOAT CARE CRP-INDICATOR: CLEAN DISCRIPTION DULON BOATBOTTOM CLEAN 24 is a very strong detergent for cleaning the submerged part of the ship. It removes effectively algae growth, green fur, calcification and barnacles. MANUAL Apply DULON BOATBOTTOM CLEAN 24 to the submerged part of the ship by sponge, soft brush or with a low pressure pump. Allow 10 minutes to take effect (prevent dehydration). Scrub with scrubbing brush or sponge. Rinse off with water, preferably by high-pressure sprayer. In case of severe pollution rehearse the treatment.