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MARYKATE
On & Off Hull/Bottom Cleaner

Powerful cleaner

Removes waterline, rust and scum. Won't harm fiberglass. Brush-on/rinse-off, biodegradable formula.
  • Quart or gallon
Product Models
Description WM Model # MFG Part # Availability Price Quantity  
On & Off Hull/Bottom Cleaner - Gallon 127979 MK20128
In stock online.

$59.99

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On & Off Hull/Bottom Cleaner - Quart 127961 MK2032
In stock online.

$19.99

Add to My List

Powerful cleaner

Removes waterline, rust and scum. Won't harm fiberglass. Brush-on/rinse-off, biodegradable formula.
  • Quart or gallon

Specs

REVIEW SNAPSHOT®

by PowerReviews
MarykateOn & Off Hull/Bottom Cleaner
 
4.8

(based on 76 reviews)

Ratings Distribution

  • 5 Stars

     

    (67)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (2)

96%

of respondents would recommend this to a friend.

Pros

  • Easy to use (62)
  • Effective (41)
  • Stores easily (12)
  • Well built / quality (9)
  • Visually pleasing (5)

Cons

  • Doesn't work (3)

Best Uses

  • Outdoors (8)
  • Boat hull (3)
    • Reviewer Profile:
    • Midrange shopper (18), Budget shopper (16), Casual/ recreational (13), Advanced (9), High-end shopper (6)
    • Primary use:
    • Personal (44)

Most Liked Positive Review

 

I have bought this product numerous times and I love it

This product can put you in the hospital if you do not use it properly make sure you are in a well ventilated area wearing and M 95 mask. If you try to use...Read complete review

This product can put you in the hospital if you do not use it properly make sure you are in a well ventilated area wearing and M 95 mask. If you try to use it without a mask in a closed garage you will burn your lungs

VS

Most Liked Negative Review

 

Bad Bottle??

Purchased On and Off on recommendation of West Marine. Was assured it would "instantly" remove everything from barnacle cement to waterline stains. It did neither. Made NO DIFFERENCE whatsoever on...Read complete review

Purchased On and Off on recommendation of West Marine. Was assured it would "instantly" remove everything from barnacle cement to waterline stains. It did neither. Made NO DIFFERENCE whatsoever on any stain! Will try to get refund from WM.

Reviewed by 76 customers

Displaying reviews 1-10

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(0 of 1 customers found this review helpful)

 
5.0

Brush on spray off easy as that

By Bob

from Bay City Michigan

Verified Buyer

Pros

  • Easy To Use
  • Quality Construction
  • Stores Easily
  • Works Effectively

Cons

    Best Uses

      Comments about On & Off Hull/Bottom Cleaner:

      Easy to use

      • Primary use:
      • Personal
       
      5.0

      I would buy it again, great product.

      By Puchito783

      from Treasure Island, Fl.

      About Me Budget Shopper

      Verified Buyer

      Pros

      • Easy To Use
      • Works Effectively

      Cons

        Best Uses

        • Boatbestsaltbe

        Comments about On & Off Hull/Bottom Cleaner:

        Hull cleaning ...

        • Primary use:
        • Personal
         
        5.0

        tried many others always go back to on off

        By bird island

        from marion MA

        About Me Midrange Shopper

        Verified Buyer

        Pros

        • Easy To Use
        • Quality Construction
        • Stores Easily
        • Works Effectively

        Cons

          Best Uses

            Comments about On & Off Hull/Bottom Cleaner:

            great product unlike all the wanna be's

            wear a mask and gloves please its strong

            • Primary use:
            • Personal
             
            5.0

            Works as advertised. Makes cleaning the boat very easy

            By Jam

            from Georgia

            Verified Buyer

            Pros

            • Easy To Use

            Cons

              Best Uses

                Comments about On & Off Hull/Bottom Cleaner:

                Works great and very easy to use.

                 
                4.0

                The name says it all. Brush it on, stain is gone.

                By Rollin Rock

                from Chestertown, MD

                About Me Budget Shopper

                Verified Buyer

                Pros

                • Easy To Use
                • Stores Easily
                • Works Effectively

                Cons

                  Best Uses

                    Comments about On & Off Hull/Bottom Cleaner:

                    Even right after a complete wax job, the Chesapeake Bay Tannin stains the hull brown. Washing will not take it off. The only other option is to buff the hull completely and rewax, a day's worth of work. A dilute solution of ON & OFF brushed on the hull removes the stain in seconds, a day's work reduced to 5 minutes.

                    • Primary use:
                    • Personal
                     
                    4.0

                    Stains go away easy

                    By The Islander

                    from Merritt Island, FL

                    About Me Midrange Shopper

                    Verified Buyer

                    Pros

                    • Easy To Use
                    • Works Effectively

                    Cons

                      Best Uses

                        Comments about On & Off Hull/Bottom Cleaner:

                        Dilute 1 to 10 water and it works just fine.

                        • Primary use:
                        • Personal
                         
                        5.0

                        absolutely recommend this product

                        By bartles

                        from Stuart, Fl

                        About Me Midrange Shopper

                        Verified Buyer

                        Pros

                        • Easy To Use
                        • Quality Construction
                        • Stores Easily
                        • Works Effectively

                        Cons

                        • none

                        Best Uses

                        • boat deck - easily brought back original white

                        Comments about On & Off Hull/Bottom Cleaner:

                        best product I've found to clean an old boat deck without damaging the gelcoat.

                        • Primary use:
                        • Personal
                         
                        5.0

                        Worked as claimed

                        By Bill

                        from Florida

                        About Me Midrange Shopper

                        Verified Buyer

                        Pros

                        • Works Effectively

                        Cons

                          Best Uses

                            Comments about On & Off Hull/Bottom Cleaner:

                            Took the yellow stains off the non-skid deck with ease. Remember that this is an acid based product so you need to be careful when applying. Follow the directions and this product works with little effort.

                            • Primary use:
                            • Personal
                             
                            5.0

                            Name says it all!

                            By RW

                            from Westerly RI

                            About Me High-end Shopper

                            Verified Buyer

                            Pros

                            • Easy To Use
                            • Works Effectively

                            Cons

                              Best Uses

                              • Boat waterline scum

                              Comments about On & Off Hull/Bottom Cleaner:

                              Works very well when cleaning any discoloration from the hull. If using out of the water, wet down the bottom to prevent run marks.

                              • Primary use:
                              • Personal

                              (1 of 1 customers found this review helpful)

                               
                              5.0

                              Awesome, but use sparingly

                              By Scouseusa

                              from Mi

                              About Me Budget Shopper

                              Verified Buyer

                              Pros

                              • Easy To Use
                              • Works Effectively

                              Cons

                                Best Uses

                                  Comments about On & Off Hull/Bottom Cleaner:

                                  I use this product every couple of years to clean the streaks and other nasty stuff off my boat hull. You have to be careful with this cleaner, it's an acid wash, so follow the instructions, don't leave it on long, wash it off thoroughly and wear skin protection. But it is the best cleaner I have found. My old boat looks like new again

                                  • Primary use:
                                  • Personal

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