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..and even more when in a city (- the silver contacts in audio mixing consoles need special attention in polluted air ). Mind you, surely that sort of rubbing with fingers or a polishing cloth generate one type of worn surface, and continual abrasion from pockets or being slid across shop counters generate another? Thinking of this abrasion, and misquoting Shakespeare in Peckis' vein: "To sleep, perchance to dream, is illogical, Captain - aye, there's the rub...: "To be or not to beam me up Scotty."