Get some stuff called Simple Green. That stuff is amazing! It's also good to used (diluted) to spray on a driveway after spilling oil, etc. It has dilution amounts on the bottle for all sorts of things. If you use that and like a wire brush you should be able to easily get out all the carbon and stuff from the intake. Then get some "brake Cleaner" as it's called (ask for it in any auto store) and use that to clean it when you're done. The brake cleaner dries REALLY fast and cuts through any grime or residual substances that are left on anything.
This is my method i'm sure there is 100's of others.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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