Get as much crud off while it is still in the water with soap, water, rag, and scrub brush to get off what you can. A ton easier to get muck off before it dries. To get any remaining stains use any number of hull cleaners / stain removers - toilett bowl cleaner will work too. They are all mild acids and you have to do it while it is on land or on the lift. Rinse thoroughly and wax.
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