You might want to try P21S Polishing Soap. I use them on my exhaust tips and it works great. It will work on any polished metal or chrome. Just don't use it on any painted surface.
I have not heard of WD40 being used before. Does that really work? I have heard of people using Paint thinner to blot off tar with a rag..that will need to be thrown away when done.
Has anyone had success with this or Stoner Tarminator? Does the Pinnacle Tar scrub brush clean up when finished...if so what cleans off the tar?