Advice needed on how to clean/polish old ugly chrome bumpers

I’m in the process of putting my 69’ Dart back together and I’m at the point of installing the original front bumper. I’d like to clean and get it shining the best I can, but I’m a little nervous cause I don’t want to damage it worse than it already is. What do you guys do to freshen up old chrome bumpers? I was thinking of trying Eagle One chrome wheel cleaner and a scrub brush or maybe Comet powdered bathroom cleaner and a red scotchbrite pad, but im nervous that the scotchbrite will scratch the chrome. Here’s a pic of what the bumpers look like. The paint is pretty bad as well but that will be addressed latter.

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I have had good results with this.

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