[/quote]You have to clean yours that often? I cleaned mine with Blue Magic metal polish back in '05 and haven't had to clean it again since, just a quick wipe down with a clean cloth once in a while.
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Well I really don't know how long I can run them without cleaning, I clean the track with the polish about every 6 months, I believe in maintaining my layout to avoid problems. Besides being retired I have the time and it's all part of routine. I also put a little grease/oil in the gear boxes on the loco's. every once in awhile.