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Mr. Kav, spray some On-Off on your lower units and the stains will come right off without even having to scrub. This is real strong stuff, so read the directions. It's mostly used to clean the stains on boat hulls that don't have bottom paint, but are left in the water for a period of time. West Marine has a knock of product that works just as well, for a little less money. I did my engine in 5 minutes!
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