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carb cleaner will get rid of carbon buildup best, but it can be harsh on rubbers/plastics. I'm not sure what is inside the IAC valve, I never took mine apart. I used Pyroil carb and choke cleaner. You could do what Ben did but soak the swab with carb cleaner, that would keep whatever is inside the valve safe too. Any auto store will have carb cleaner as well as brake/electrical cleaner, so don't wory where to find it.
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