Carb cleaner-any crap will do. I got some cheapo stuff for $1.99 at Murray's.
-IAC-since the carb cleaner is in an aerosol can, just spray in one of the two holes and let it soak for a couple minutes then dump it out. It'll evaporate really quick.
-TB: I used carb cleaner and an old tooth brush and just scrubbed the deposits and cleaned with a napkin.
