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OH, and also, if you are concerned with "getting it all out" , then there is no real hope, you are fixated on the cause, not the problem. In my mind, you should want to fix the problem, the slight miss at idle. If you want ALL the carbon out, forget it, you never get ALL the carbon out, unless you want to take the heads off, have it all cleaned out, and never start it again. In that case ALL the carbon is gone forever. You run the engine, you get carbon. If the engine is never driven hard, it accumulates and can cause problems. Other things worsen it as well. But more than likely, it's just accumulating because it never is driven very hard. You can just take a sparkplug out and see how much is on the top of the piston, but if you don't know what a normal amount of carbon looks like, it might not be all that useful to even look.
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