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The Starbrite Instant Hull Cleaner appears to be the same stuff as the MaryKate On-and-off, which we have used to clean waterline scum after a season in the water. It is very effective, but really nasty stuff - don't get it on you! It also quickly removes the galvanizing from your trailer - I mean like in a few seconds it takes you down to bare metal. Use with caution! We use a throwaway paint brush to dab on where it's needed, and have a second person standing by with a hose to take care of any drips on the trailer.

Tim