In Reply to: Re: Cleaning Spark Plugs posted by Dean on July 23, 2019 at 13:06:36:
Back in the 1960's, our shop had an abrasive blast cleaner which was sold by AC (spark plugs). ...It used a very fine abrasive (possibly aluminum oxide) and cleaned plugs very well if there was no oil on them. ....Dry carbon was no problem.
In the 1970's or 1980's (CRS) it was no longer recommended to blast plugs because there were concerns about abrasive lodging in the shell and getting into the cylinder.
I personally experienced new plugs getting flooded and not firing, even after blowing them out with compressed air. ....Only another set of new plugs would allow the engine to start.