As mentioned, everyone has their personal favorite. Me, I use Goo-Gone first followed with an denatured rubdown to remove the crap that the Goo-Gone loosens up.
I've tried other things but keep coming back to Goo-Gone. No matter what I used, if I would follow up with a Goo-Gone "test" I would get more dirt coming up. So now I start with it but like to remove it from the rails, thus the denatured follow up.
I use a pipe cleaner for inside but with the modern tubular, it's impractical to do both ends, given that they newer track has its pins crimped in place. I started doing this one year after seeing black gunk on the pins where ever there was any type of gap between 2 pieces of track, which is almost unpreventable. I was amazed at how much gunk seemed to force it's way inside the rail. Not far in, but definitely there.
- walt
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