You want to do plugs on a hot engine. The heads expand and make the threads a bit looser. You do not want to overtorque it. I put thread it by hand, till it's finger tight (holding it by the extension) then put the socket on and do no ore than half a turn. You can feel when it's tight enough. I would not trust a wal mart torque wrench... Always use anti size and di-grease imo... It's cheap protection. As for cleaning... Get a cheap can of compressed air like for cleaning computers. It's a good idea to get junk out.
2003 Mach 1