Spark plug cleaner

FWIW - They work but you will need ~80 psi air. Get a spare bag and
spare media, and spark plug washers.

Next time you go to the dentist for a checkup, also get a couple of
his dental picks. Use them carefully to pick out the lead chunks
before blasting the plugs. Don't blast the plugs too much but wire
wheel the threads before reinstalling them using a small amount of
anti seize. Preferably clean the spark plug hole threads too so they
will remove easier next time. Use a beam type torque wrench.