I talked to the folks at Pro Line and Sea Pro and they both said what they reccommend is toliet bowl cleaner,(liquid type you buy anywhere). I squirt it on or pour it on a sponge and wipe it on and let it sit for about 5 minutes and then wash with a sponge. It will take the nastiest stain (brown water stain) off.
Remember to use it only on the outside of the hull. If you get it on hinges or metal it will discolor. I have been using it for years on the hull of my V.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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