Cleaning a Bennington pontoon boat is simple if you do it regularly. Start by rinsing the whole boat with fresh water after each trip, especially if you run in saltwater. Wash the deck and fences with mild soap and water, and use a cleaner made for marine vinyl on the seats to prevent cracking and mildew. For the aluminum pontoon tubes, use a cleaner made just for pontoons to remove waterline stains and bring back the shine, then rinse well. Avoid harsh acids unless the product is made for aluminum, and always follow the directions. Drying the boat and covering it when it is not in use will keep your Bennington looking new. Your owner's manual lists the products Bennington recommends.