Need help understanding Mopar ignition…no spark

You can clean oil/ gas off plugs with anything that evaporates fast. Aerosol parts cleaner, carb cleaner or starting fluid. Use the snorkel, give a blast or two directly into the plug AWAY from you and let them dry.

A plug that sparks in open air MAY NOT spark under compression. I don't suppose you are old enough to remember the old sandblast plug cleaner / testers. You screwed the plug into a test chamber with a window, and pressurized it with air as you supplied spark voltage. At some pressure the plug would stop if bad