Full strength, just spray it on the outside and use the toothbrush. I wouldn't bother with the overnight soak, or crockpot. Then rinse and oil it after. A hair dryer on the carb after a soaking in fuel or acetone, carb cleaner, laquer thinner, whatever is handy. Then carefully turn the barrel until it is free, with the locating screw out. Clockwise is best as the screw loosens if you go the other way. Carefully though, don't break the arm. Use a 10-6 prop or so to run it on a test stand. You may need to make paper gaskets up.