xylene it is a solvent with a very high flash point great for removing paint, sap, sitcker glue and will make tar run right off your car too like water and wont hurt the cars finish I used it on a used boat to get years of duct tape off and it didnt hurt the plastic. Wear good rubber gloves.
A couple years ago a friend's kid got heavy railroad grease all over his clothes while hiking down the Royal Gorge. I gave her a cup or two of "Fast Orange" with pumice,--- the stuff that you clean your hands with after working on the car.
She pre-treated the clotheswith the stuff, scrubed them and they came out good as new in the wash. If it works on cloth, it should work on a boat easy.
Years ago I took my Huricane down the upper A and dragged it along the railroad tracks from Tacoma to the takeout parking lot- tons of creasote on the bottom (lazy yes, but it worked at the time). I just took it to the local car wash and blasted it with the engine/tire cleaner stuff- seemed to work ok but then again Prijon plastic is pretty tough stuff, not sure what it would do to a newer boat.
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