Read the Goo gone instruction page. It clearly states that the product WILL damage rubber.
Here is a story from someone who used it to remove chewing gum from rubber. It destroyed the rubber.
No argument re Goo-Gone interaction with rubber.
However...
I'm not sure most traction tires for the model/toy train engines have a significant rubber content. That may be more intuitive than fact. There are a lot of synthetics that have the qualities necessary to improve traction over metal-on-metal (e.g., Bullfrog Snot).
Besides, removing residual cleaning fluid of any type from the track would seem to just make good sense for improving traction, minimizing continued dirt attraction and gunk build-up, and avoiding electrical problems. That's the advice we give our customers.
Like I said, though, to each his own. If you find something that works, stick with it.
KD
