It's also not needed, when I solder to tubular track, I'm sure any tinning that's on it is gone after the Dremel tool gets done. A little rosin flux and plain 63/37 Rosin Core solder does the job just fine with no soldering issues at all. There is no need for acid based prep for any track I've ever seen! If you can't solder to clean steel track with any surface corrosion and rust removed, you're not using the right tools.
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