[quote=tominpa]Muriatic acid and some of the other products mentioned above are pretty caustic and hazardous. A gel coat hull can be cleaned with Oxalic Acid which is the same stuff you use on wood decks and siding to remove mold, mildew and stains. It works great, but takes a few minutes. The thing is, you can have skin contact with oxalic acid. The West Marine hull cleaner is made from oxalic acid, and the good news is you can buy it cheap at Home Depot in the form of Deck cleaner. It will deep clean, and allow you to add a polish and wax system over the top for sealing.
HCl is certainly powerful, but if you're not into wearing chemical resistant gloves or killing everything where you apply it, get oxalic acid cleaner, or West Hull Cleaner (same thing).[/quote]
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