Despite my best effort to clean up a corroded spark plug and blowing the area with compressed air before removing would it be bad news if dirt or grime falls into the engine in the process of removing it?
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It can be, depending on what you get in there. If it is a metal shaving or something hard enough to survive the temperature you could damage a seal, or cause valve damage, but if it is just a piece of lint or dust I wouldn't worry.