Get double the cleaning power with this 2-pack of MaryKate On & Off Liquid Hull & Bottom Cleaner (1 Gallon). This powerful formula works instantly to remove tough waterline stains, algae, barnacle buildup, rust, and gas exhaust marks from your boat’s hull. Safe for fiberglass, it won’t harm your gel coat and will restore your boat’s shine. Ideal for maintaining multiple boats or having extra on hand.
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