I just use the hobbico brand, my lhs has them in a box at the checkout desk. I do 3 to 4 drops down the carb and hit it with the starter for a couple seconds to get it thrown all around. I do the same with my nitro cars too. If you use a nice filter setup for fueling, you shouldn't have to worry too much about getting trash in your fuel.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ811