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Given how cheap plugs are, and how infrequently you change them, in the grand scheme of things I wouldn't remotely consider blast cleaning them. In the piston aviation world, where many run what are called "fine wire" plugs that are $80-$100 a piece, yes, you "service" (clean) those. In a car where the plugs last 30k are are less than $10 a piece, why bother? The risk of getting grit into a cylinder is very real.
Patrick
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