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On & Off Hull & Bottom Cleaner works instantly to remove tough waterline stains, algae and barnacle staining, rust, and gas exhaust stains. Brush it on and rinseformulated for use on fiberglass.
Best Use Case: Best for routine or seasonal cleanup of waterline staining, algae/barnacle discoloration, and rust/exhaust marks on fiberglass bottomsespecially when you need fast, targeted cleaning before further maintenance.
Common Issues: Avoid using it on surfaces other than fiberglass. Always apply as directed (brush on, then rinse) and follow up with rinsing thoroughly to clear residue from the cleaned area.
Browse related Cleaning & Polishing to complete the installation.
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