I agree a little pneumatic die grinder with a wire wheel and it is relaxing. As far as scratches left behing, the silicone you apply with the new gasket will easily fill the tiny voids and in addition help the silicone "bite" better. Now if I were working on the engine and internals exposed I would have to try a scraper and elbow grease but a component on the ground away from the car use the wire wheel.
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Originally Posted by trularin
Air wire brush.
GM has used RTV since 1974. Their shop instructions were to use an air powered wire brush. Makes a mess, but it all comes off.
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