I'm not sure you can remove some of the plastic parts roebuck, and that is the main reason I greatly prefer a brief squirt with fairly strong solvent (carburetor cleaner) followed by blowing the solvent out with air pressure, before it has a chance to eat the plastic.
You can soak the carburetor in a light oil-based solvent such as kerosene, mineral turpentine, white spirit etc. They are much the same mixture of substances as petrol, which the carburetor is designed to be exposed to. You will need to blow out the solvent when you finish the soaking, to get rid of whatever it has dissolved. Many years ago I used to try to clean carburetors that way, but the effectiveness was quite marginal. It will not dissolve gum, which is usually the main problem.
