CRC Industries Deck & Hull Cleaners

CRC Industries & the MaryKate Legacy in Deck & Hull Cleaning

When it comes to keeping a boat's hull and deck looking its best, few names carry as much authority as CRC Industries. Founded in 1958, CRC has spent more than six decades formulating professional-grade chemicals for the marine world — and nowhere is that expertise more evident than in their Deck & Hull Cleaners lineup.

The backbone of CRC's hull-cleaning legacy is the MaryKate brand. CRC acquired the MaryKate® brand in 2001, bringing aboard its marine appearance products — including the #1 hull cleaner, On & Off — as the perfect complement to CRC MARINE's professional-grade marine maintenance chemicals. That acquisition cemented CRC's position as a one-stop source for both mechanical maintenance and surface care on the water.

MaryKate On & Off Hull & Bottom Cleaner: The Flagship Formula

The crown jewel of CRC's deck and hull cleaning portfolio is the MaryKate On & Off Hull & Bottom Cleaner. This formula works instantly to remove the toughest waterline stains, algae stains, rust, and gas exhaust stains. For boaters dealing with the relentless buildup that comes from regular time on the water, that fast-acting chemistry makes all the difference between an afternoon-long scrub and a quick, satisfying rinse.

Marketed as the #1 hull cleaner and strongest formula available, it works instantly to remove the toughest waterline stains, algae and barnacle stains, rust, and gas exhaust stains — designed for use on fiberglass only and will not harm gel coat. That last point matters enormously: boaters with fiberglass hulls can use the product aggressively without worrying about surface damage.

The application process couldn't be more straightforward. It works instantly and is easy to use — just brush it on, then rinse it off. CRC also offers a MaryKate On & Off Gel Hull & Bottom Cleaner (part no. MK3532) for situations where a thicker, cling-style formula is preferred, giving the active ingredients more dwell time on vertical surfaces like the waterline.

A Broad Marine Cleaning Ecosystem

Trusted by boaters and boat service professionals for nearly 50 years, CRC MARINE professional-grade maintenance chemicals include cleaners, lubricants, electrical maintenance products, fogging oils, corrosion inhibitors, fuel stabilizers, and more. The hull and deck cleaning products sit within this larger ecosystem, meaning boaters can rely on a single brand family for virtually every aspect of marine maintenance — from protecting electrical connections to keeping topsides gleaming.

MaryKate provides a complete line of premium cleaners, waxes, soaps, and specialty appearance and boat care products , ensuring that hull cleaning is only the starting point. Once the hull is cleaned, compatible MaryKate polishes and waxes can be applied from the same trusted brand family to protect the surface going forward.

Why Choose CRC Industries for Deck & Hull Cleaning?

• Proven Formula: The MaryKate On & Off line is recognized as the marine industry's number one hull cleaner, with decades of use by professional marinas and weekend boaters alike.
• Instant Action: Fast-acting chemistry removes stubborn waterline stains, algae, rust, and exhaust deposits without prolonged scrubbing.
• Gel & Liquid Options: Both liquid and gel versions are available to suit different application preferences and surface orientations.
• Gel Coat Safe: Formulated specifically for fiberglass surfaces without damaging the underlying gel coat.
• Professional Pedigree: CRC manufactures over 1,300 chemical MRO products across automotive, marine, mining, oil & gas, hardware, electrical, industrial, and welding markets — depth that shows in the quality of every formula.

Whether you maintain a pontoon, a fiberglass runabout, or a full-sized cabin cruiser, CRC Industries brings the same professional-grade approach to deck and hull cleaning that boat yards and marinas have trusted for generations. Browse the full selection of Deck & Hull Cleaners or explore the complete CRC Industries catalog to discover the breadth of their marine chemical expertise.