Box-elder bugs, huh? Those must be what we called "telephone bugs" back in Texas, 'cause they said "hello and hung up!". The things we remember from our youth. Anyway, I cleaned a couple of carbs with Pine-Sol in my sonicator and they came out great. The only downside, if in fact it can be attributed to the Pine-Sol, was that the carbs got a layer of corrosion (much like flash-rust) almost immediately.