How do you clean model railroad track?

There are several methods for cleaning wheels. A couple of manufacturers make a special brass brush device that connects to the track or power supply and will provide power to the locomotives wheels when touched to them. There are a couple of devices that use special pads and solvent to clean the wheels of the locomotive when it is set on them. Check the Walthers catalog or website. Some modelers apply a light oil to the track and run the trains across the track several times. This will loosen dirt on the track and wheels which is then easily wiped off with a lint free cloth.