Ive got a 1997 22ft Powerquest.....this isnt an engine problem, just a question. Ive noticed that after I use my boat, grease from the thru hull exhaust ports has a tendancy to stick to the back of the boat, and part of the sides. Its a white boat, so its a pain to scrub it off. I usually have to take it out of the water and use 409, or Simple Green to get the grease off. Is there anything I can put in the motor itself to try and get rid of that grease/engine dirt that is expelled from the exhaust?