Yeah, IME you can fill scratches in chrome, but you can't buff/polish them out. The chromium is just too hard and too thin for abrasive approaches to work.
I've been looking for a way to do this since taking delivery of the Jag in '85...now, years later, some of its chrome is worn away (down to the underlying layers of plating) but the scratches are still there in the remaining top layer of chromium. So IME the only way to get rid of scratches in chrome is to get rid of the chrome, not exactly a good solution :grinno: