how do you get yellow stains of the hull?
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how do you get yellow stains of the hull?
3M Marine Rubbing Compound followed by 3M marine polish applied with a random orbital buffer seems to be pretty foolproof. It will remove a good bit of oxidation which is probably what the yellowing is. Don't forget to follow up afterwards with a good quality wax that has UV protection.
DKJ
If it is real bad, sno-bowl toilet bowl cleaner will clean it in seconds. Just whipe it on with a rag and rinse with water.