Roto, what easier and more effective methods are you alluding to?? I thought the ultrasonic method would be the most effective way to go- letting the sound waves do the work. Am I missing something?
My carbs have sat for 17 years, but they were always drained and run dry prior to storeage so I've never had much of a problem with gum and varnish. Corrosion is my main problem, along with possible rust or sundry debris clogging the jets, etc.