Friend at work gave me a hot tip to remove the scum/exhaust film from lower unit on my Merc. Said use Tidy Bowl. Put it in a spray bottle- spray it on, rinse it off. Gave it a try today with boat in driveway and scrubbed it lightly with a window brush. Works fantastic, lower unit nice and clean. Dammed driveway and hand are blue. Doesn't wash off. At least it's Easter weekend, can tell everyone I was coloring eggs.
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