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1 season in a marina really did a number on the old pontoon. I used to trailer it to every lake, but decided on a slip last year. Now it's rub rails are scuffed, logs are scraped, someone hit the motor at some point and gouged the case, but worst I think is the horrible algae stained toons. I got about to cleaning them today and wanted to share with everyone my results and how super simple they were to achieve. I used a product from NAPA called Mac's Aluminum Brightener. I liberaly sprayed it on the log a section at a time, let it soak and turn white, gave it a quick scrub, and hosed it off. It just melted the algae away. Very wicked stuff though so be careful not to get it on anything other than bare aluminum. Happy Boating!