Muriatic acid, spray on and rinse immediately. Do this as many times as necessary unitl stain is gone, will also remove barnacle and shells off bare bottoms. I recommend stripping any wax off the gelcoat with degreaser first so the acid will work better then re wax when done. Can be used on motor for barnacles but do it at own risk! ON then OFF immediately! Will turn bottom paint green if allowed to run on it. Used this when I worked for a popular boat detailing company in the keys. THIS is done at your own risk. Cjg8r not to rain on your parade but keep snobowl off your boat, it is an abrasive and will scratch the crap out of your paint and gelcoat.
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