At the end of the thread just now (September 5 at 5:37) i appended a long report on what worked, what didn't and what I am going to do . . . .
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A few weeks ago I reported on my experience using Simple Green cleaner on my Fastrack: I used it for several months, and it cleans wonderfully but even when used with lots of wiping leaves a thin, invisible tacky goo that attracts grim and that eventually builds up on center rollers, etc.
Ethanol alcohol, lots of work, and lots of paper towels removed all the goo from the track surface surface. I went back to using just that and bright boy erasers and thought that was the end of it.
DISASTER. One reply to my thread or another on the subject of track cleaning frightened me at the time. I don't remember who, but someone either very perceptive or having learned from experience said that capillary action can draw cleaners like Simple Green into the joints between track sections where it dries/hardens/builds-up/whatever until it interferes with electrical conductivity.
It seems this has happened to my mainline (thankfully, the only loop I have that I cleaned most heavily with Simple Green). I have not run my trains for weeks but I took some time and tried this week. Over half of the joints between tracks on my main (72" curve or bigger) mainline loop have stopped conducting across their joints. I have about 200 pieces on this 140 foot loop and I estimate that on at least 80 of them, either the center or the outside rails are no conducting power across the junction.
Any bright ideas on how to remove this stuff? The track is permanently afixed, but the way - I made sure of that. Removing it means almost certainly destorying it (fine, it would be expensive, but I can buy more if I have to) and also destroying the layout everywhere around it (not fine: just can't do it).
Any ideas on how to fix this easily, magically?