that crud is surprisingly easy to remove. I've use Slimey Grimey and Marikate on and off. Both work great.
The trick is to put it on when the boat is fresh out of the water. With Slimey you mix with hot water and spray with your garden sprayer. With Marikate, I buy the gel version and roll it on with a cheap paint roller. In either case let it do the work, the longer it sits the better. It will make the brown stains disappear. The waterline may take a lttle scrubbing. I clean a 35' boat with my wife in two hours, tops.
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