Your kayak is designed to need a minimum amount of maintenance. A simple fresh water rinse or mild soap washing is all that is needed, especially if the boat is paddled in salt water. Composite boats can be waxed with a good quality marine or car wax. You may also use 303 Protectant to add sun protection and bring back shine to your kayak's surface and keep the outfitting and hatches protected. This works for both plastic and composite kayaks.