Apart from taking it to a garage I don't think so.
You can clean it on the car using a fluid that will evaporate but I wouldn't reccomend it as although the fluid will evaporate all the crap from around the butterfly wont and will go into the manifold.
Guess you could put the ignition on, place something on the throttle pedal so the butterfly opens and give it a clean.........but I personally wouldn't as there pretty delicate.