Use muratic acid. I use an all-plastic spray bottle (garden type, cheap, Wal-Mart) to spray it on the hull. Let it soak in for a few minutes. Use a long pole car wash brush. Rinse well. This will corrode your trailer if there are any rust spots or paint chips, so rinse the trailer well. This will release chlorine gas. DO NOT do this indoors. Stay upwind. Do half the boat at a time and move the boat so you are upwind. Work from the bottom of the hull and work back toward you. This will also damage your skin, so use long gloves and safety glasses. For small spots, use FSR gel.
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