[deuce_roadster]

I used to use a big box of drywall screws as their sharp pointed ends broke all the hard crud loose while sloshing it with your favorite solvent. Acetone, MEK will cut the old stuff that was used before the ethanol was put in the gas. I shouldn't have to say this but be extremely careful when using any solvents, double eye protection and respirator, double rubber gloves etc. Kinda like the people taking care of Covid patients.