Just a reminder:
Do NOT clean your Precious Metal Rhodium plated contacts with sandpaper, cream polishes, abrasive pads, chemical cleaners, deoxits, brasso, mothers, flitz, cape cod cloths etc etc etc!!! I can't drive this home enough. Both the bottom switch screw in post, switch on the 10440 and top cap center post are Rhodium plated.
Rhodium is a precious metal, just like gold, it won't tarnish, rust, deteriorate, corrode or oxidize. You can bury it in the ground and dig it up 10,000 years from now and it'll look just like it does today.
The ONLY thing you should be cleaning it with is a soft cloth. If it get dustys or some juice on it, just wipe it off with a soft cotton cloth. Worse case scenario, you drop it in the mud, you can wash it with some warm water and soap and then wipe it dry with a soft cloth.