FWIW
Most rust removers will contain phos acid. OK on steel. If used on chrome, I've had it get under the chrome and cause peeling.
There are all sorts of ways to clean chrome - many are listed here.
On anything chrome that I CARE about, such as old bike parts, I do it by hand using
Nevr-Dull wadding (auto parts store) wet with White Diamond Chrome Polish (search the Net). Then, a good coat of paste wax!
It is slow, requires patience and a lot of elbow grease. However, if there is any chrome left, this combination will find it without any further damage. Everything chrome on the 550 got this tlc (and needed it).
As was well said earlier, "Different strokes for different folks".