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Spray throttle plate cleaner will work well. You could send them out and get them "cooked" but if they are black the color may either come off or get discolored.
John
I had great luck with my small ultrasonic cleaner (I got it from Harbor Freight to use on gun parts) and warm water / dawn dish soap. small wire brush to work on the tough stuff (after its soaked)
(in all seriousness, a lot of gun cleaners work REALLY well to soften up carbon)
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