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Pressure washings the trick! I had picked up a cheap pressure washer this spring and used it a couple of weeks ago on the boat. Has a serious black dot problem when I got the boat new after sitting on a lot for a winter and it was only getting worse after 2 years. I was astounded by the great job the washer did in cleaning up the dots. Never able to touch them with any sort of cleaner. Only caveat. Keep the nozzle really close. Nothing happened until I got within 3 inches of the surface. I was only able to clean ~ 3" inches at a time but it did the trick. Now that its done its probably only a once a year thing to keep the dots under control.
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