Thorough cleaning of the carb is best done by soaking only the metal parts in Berrymans Chem Dip for 24 hours or longer. In addition to the carb rubber gaskets, the carb drain and air/fuel (pilot) screw have O-rings on them. The float valve has a rubber tip and the float is plastic. None of these items go in the Chem Dip; it will ruin them.
After soaking, the parts should be removed from the Chem Dip, rinsed thoroughly with water and all the openings (jets and passageways) in the carb blown out with compressed air. Skipping any of these steps may result in a carb that isn't clean.