I treid Simple Green on mine a while back, and it works great to cut through oil and grease scum, plus it is biodegradable. I am sure there are more powerful cleaners, but this one doesn't cause my neighbors to call the "green" police on me down here in So. Cal. Give it a shot, should be at any grocery store, works better than you'd expect.
I will second the simple green. It is a very good cleaner for everything. ANother product I have found to be amazing is "Barkeeper's Friend", but I'm not sure if it would work on an intake. It did wonders on all of my trim pieces.
67 Pro-touring Camaro-327, 9:1, Comp XE268 Cam, Perf. RPM Intake. 750 Holley, Sportsman II Heads, Ceramic coated headers, 700R4 trans, 17" Amer. Racing TT2's, 12" disc brakes, custom stereo, black with white stripes, cowl ind. hood.
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