A very fine polish
This photo shows the dirty, pitted chrome. You need to be quite careful in what you use to clean this up. Chrome is a plated material and if you use a harsh abrasive polish you will get scratch marks that can not be removed, unless you re-plate it. This is one reason why we reformulated with our new fine abrasive and cleaners, to get a great finish with chrome.
Important to note that in some extreme cases of pitting, the Metal Polish, or anything else for that matter, won't work. the only thing that can be done to bring up the finish is to re-plate the chromed surface.