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Message: <blockquote data-quote="thill" data-source="post: 518875" data-attributes="member: 4972">I start with Purple Power and a shot of bleach in a pump bottle with a green or gray Scotchbrite pad.   That takes care of the scum. If the aluminum itself is stained, I will move on to Aluma-Brite, similar to the StarBrite product above.   The trick is to put it on, scrub it a bit and then rinse it off.   No, it won't corrode your boat, unless you forget to rinse it off, then it's possible.  Leave it on too long and it will make the aluminum look hazy or even chalky.    It works so fast there is no reason not to have a hose next to you to rinse and move on.</blockquote>