Bought a Merc outboard motor which unfortunately spent the last 3 months hanging on a pontoon in the Fox River in Chicago (always IN the water of course), it sustained some 'attack' to the lower unit finish. Nothing is damaged mind you, but the lower unit was covered with slime, little tiny red worms, and some serious water deposits. All I've done thus far was to scrub it up and get the big stuff off. No chemicals or anything. The thing is, now it hangs off the back of a completely restored little runabout, and it looks bad! Any help here?