Not particularly for outboards, but I have heard that a mix between some sort of cleaner and diesel or something along those lines works well. I would try some sort of chemical mixture as long as you are doing a cosmetic restoration. I will ask some of my friends that are more “gear heads” than I am to see what the particular mixture was.
"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."
