Hi. I use 400 grit wet/dry sand paper for heavy tarnish on the rails,and 1,000 for light tarnish.
I only run indoors, but have bought a lot of track that has been used in an outdoor setting.
Experiment to what works best for you, and your needs.
I use Isopropyl Alcohol on strips of paper towel for general cleaning of grease and residue on the track after that.
Soap (Dawn),hot water,and a Scotch Brite pad works great for the ties.
Sorry, but I've never dealt with glue on any of my tracks.
No matter what you decide on, do not use a power tool of any sort on your rails as you'll only damage them as Dan already mentioned.