If you use Goo gone you will be replacing rubber tires frequently. Sandpaper can eventually remove the plating on the rails and will leave tiny scratches that will collect dirt. If your track is too rusty just toss it. TV tuner cleaner has OIL in it. It will eventually get into the pins. I use the green scotch pad if really dirty, or a Bright Boy pad, then wipe with denatured alcohol or the 90% stuff. I think there is some merit to trying to clean the inside of the rails out if you can. I have done this with a properly fitting drill bit in a pin vise. You would not want carb cleaner or brake cleaner in your train room. It eats paint and its not good for your hands as well. MTH only recommends using denatured alcohol to clean track.
Rob