After discovering the merits of using a "MAJIC ERASER" product for cleaning styluses, I thought I would try using a piece of this material to carefully clean tube pins. Does an excellent job with no residual debris. Then I treat the sockets and pins with KONTAK, using a fine syringe for the sockets and lint free applicators for the tube pins. On the whole, this is reasonably quick and works well. I notice much cleaner high frequency reproduction. It's worth the effort. Just be careful when treating sockets to let the pin interface dry after re-inserting the tube in it's socket. This is also an excellent process for cleaning and treating bare copper spades and binding posts. Yields a similar audible improvement.