i've had good luck with Berrymans carb and fuel injector cleaner, available at any auto parts store, get 2-3 cans and dump them into a larger resealable metal can, i also have a carb cleaner/agitator that moves the parts back and forth using Berrymans carb dip solution, thats available in 1 gallon cans, awesome stuff for cleaning carbs and etc.