Has anyone had experience cleaning barnacle residue and other gunk from the bottom of a high-density polyethylene hull (Watertender 9.4)? I scraped off as much as I could but it is still badly stained below the water line, mostly hard stuff. I hesitate to use steel wool or other physical abrasive to get it off for fear of badly scratching or wearing down the HDPE. Is there a product that will cut through the left-over residue without melting the hull? "MaryKate On & Off" would seem a good bet except that it says it is only for fiber glass, and the company confirmed in an email that I should not use it on HDPE. Any thoughts?
Thanks. Jeff Sheler "Wind Some" Portsmouth, VA
