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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

Find in Store 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
 
4.7

(based on 83 reviews)

Ratings Distribution

  • 5 Stars

     

    (72)

  • 4 Stars

     

    (6)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (3)

95%

of respondents would recommend this to a friend.

Pros

  • Easy to use (68)
  • Effective (47)
  • Stores easily (16)
  • Well built / quality (9)
  • Visually pleasing (5)

Cons

  • Doesn't work (4)

Best Uses

  • Outdoors (8)
  • Boat hull (3)
    • Reviewer Profile:
    • Midrange shopper (22), Budget shopper (16), Casual/ recreational (13), Advanced (9), High-end shopper (7)
    • Primary use:
    • Personal (51)

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 83 customers

Displaying reviews 1-10

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5.0

Cleans with ease

By John

from Westport, MA

Verified Buyer

Pros

  • Easy To Use
  • Works Effectively

Cons

    Best Uses

      Comments about On & Off Hull/Bottom Cleaner:

      Works very effectively to eliminate scum on the waterline.

      • Primary use:
      • Personal
       
      5.0

      I would buy this product again works great

      By Dan

      from Cape Cod

      About Me Midrange Shopper

      Verified Buyer

      Pros

      • Easy To Use
      • Works Effectively

      Cons

        Best Uses

        • Cleaning boats

        Comments about On & Off Hull/Bottom Cleaner:

        Great product works like magic cleaning off rust and water slime

        • Primary use:
        • Personal
         
        5.0

        Who would have thought!!!

        By summerforever

        from Lansing Michigan

        Verified Buyer

        Pros

        • Easy To Use
        • Stores Easily
        • Works Effectively

        Cons

          Best Uses

            Comments about On & Off Hull/Bottom Cleaner:

            MaryKate---this stuff is amazing. Used on Yamaha jet boat. Had previously tried other materials and had to work really hard and took very little of the hull mess off. Then along came MaryKate. Wore respirator--(needed) and used rubber gloves, applied using the brush that I usually wash boat with. I didn't even work hard. Brushed it on and hosed it off--and I mean off--it looked like I had just waxed the hull. Have recommended this to several other boaters--they had never heard of it. !!!

            • Primary use:
            • Personal
             
            5.0

            Great product would recommend to anyone

            By DC

            from Chicago IL.

            About Me Midrange Shopper

            Verified Buyer

            Pros

            • Easy To Use
            • Stores Easily
            • Works Effectively

            Cons

              Best Uses

                Comments about On & Off Hull/Bottom Cleaner:

                Spray on with pump can sprayer let sit for 10 minutes & power wash off

                • Primary use:
                • Personal
                 
                4.0

                Good product.

                By Mike

                from Wales Twp, Michigan

                About Me Midrange Shopper

                Verified Buyer

                Pros

                • Does a real good job at removing scum line
                • Easy To Use
                • Stores Easily
                • Works Effectively

                Cons

                • Take wax off hull

                Best Uses

                • Hull scum line/bottom cleaner

                Comments about On & Off Hull/Bottom Cleaner:

                Good product , works as shown on label

                • Primary use:
                • Personal
                 
                5.0

                Working with on & off

                By none

                from Groveland Mass.

                About Me Midrange Shopper

                Verified Buyer

                Pros

                • Easy To Use
                • Stores Easily
                • Works Effectively

                Cons

                  Best Uses

                    Comments about On & Off Hull/Bottom Cleaner:

                    Product works as advertised. Just follow the instructions and your hull will be free of scum lines.

                    • Primary use:
                    • Personal
                     
                    1.0

                    Didn't work at all this year

                    By Bob

                    from Mpls

                    About Me High-end Shopper

                    Verified Buyer

                    Pros

                      Cons

                      • Has worked in the past but not this year,
                      • Ineffective

                      Best Uses

                        Comments about On & Off Hull/Bottom Cleaner:

                        Has worked every year but this year. It was like cleaning with water

                        • Primary use:
                        • Personal

                        (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

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