Not sure if this tip has been posted before, but I was attempting to clean the 510 and the battery contacts on my provari yesterday with a q-tip and some alcohol, and it was taking forever. A little lightbulb went off in my head and I was thinking that a pencil eraser would probably work well, due to the friction they have, and it worked awesome. A standard pencil eraser fits perfectly in the 510 connector and a few twists back and forth brought the finish back to looking like new. I did the same to the battery contact inside the tube and that's clean as a whistle now as well. Just thought it would be worth sharing just in case it hasn't been mentioned before.