As i have to clean the carbs of my Peels,- not the Schmitts-, once a year after the winter period, i do it in two steps.
After the carbs are dismantled in parts, everything gets cleaned with brake cleaner spray, and dry it with compressed air.
Step two: Rob your wifes ultrasonic jewelry bath- yes sure she has one, because every woman has one- and fill it with distilled water: Put all the parts in the bath and leave them there for about 20 min.
Reassemble the carb and it should be perfect.