I keep seeing this mentioned, including on Ebay, that to clean up that "old chrome that has rust and pits" just take some mild steel wool to it. Chrome is a very thin layer over nickel, abrasives will only shorten the life of the chrome and expose the nickel. If the chrome is dull, pitted, and showing that old yellow look, rechrome it. I haven't checked, but some inhibited oxalates may remove the rust. I would be careful with any ferric chloride compounds also. Regards, Ross