Soaked in Gunk carb cleaner. It takes off the crud
from and in the carb body but its still discolored.
I removed the black coating with any number of
solvents, cleaners, pads, sand paper, and brushes.
My system is mostly a little of this and a little
of that.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.