MaryKate On & Off Hull & Bottom Cleaner

Product Description:The best selling, most used hull and bottom cleaner on the market today, Marykate On & Off instantly removes waterline stains, algae stains, rust, and exhaust stains. The advanced, industrial strength formula softens barnacle rings and zebra mussels for easy removal. Safe for use on fibreglass, just brush it on and rinse it off!