I clean my spark plugs. Gasoline, fine sandpaper, steel brush.

Back in the 80's I used to have the following items to tune up an engine. A timing light, dwell/timing analog meter, spark plug cleaner, feeler gauge, oil filter wrench and the Chilton's Auto Repair manual the size of a webster dictionary!

I only used these items twice before I started to work overseas. The Chilton manual is "the holy grail" of most makes/models of automobile then. It has everything.

All of these items are now gone. The last thing I know (1988), my (late) brother lent it to his (late) mechanic friend.

Whoever has it after is lucky.