Hi Tom,
Actually, any cleaning method that is abrasive will cause fine scratches that collect dirt and invites oxidation. I was warned off of using anything like a "bright boy" or Scotch-Bright on any track, solid or plated. But everyone has their own opinions. I know from personal experience that a solvent, like 91% isopropyl alcohol, is best for cleaning non-problematic track and wheels. The Rail Zip seems to leave a film that prevents oxidation with these temperamental situations. I don't want to start a debate, but I am only saying what I recommend, and I always err on the side of caution. When I have to clean heavy gunk off of metal wheels, I use a plastic fast-food knife, never a metal knife or screwdriver, or anything metal or abrasive, because they cause the fine scratches.
Take care, Joe.