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post #7 of Old 06-14-2011
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600 grit wet/dry sandpaper

If none of the chemical cleaners work, get a bit of 600 grit sandpaper and rub a short length of waterline to see if the discoloration will come off. If it doesn't, it has penetrated the gelcoat. If it has penetrated the gelcoat, cleaning and painting is the most practical solution.
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