We got some bad discoloration on our hull and transom while in the yard. It was from bottom paint sanding dust getting on the boat and then the morning dew would get it wet. We had to use polishers and rubbing compound to get it off. Then we waxed it to protect. A week or so later, to our astonishment and horror, the stains were back. Not quite as bad but pretty close. Again we slaved to get out boat white again only to see them re-appear again. Anybody else ever see stains buff off and come back again? What can I do to solve the problem permanently? Thanks. Doug