I try to avoid steel wool just because of the stray fibers.
There's a product called "Colonel Brassy" that a few bike shops carry. It is hands down the best stuff I've found for chome. It will not scratch.
I've found it online a couple of times, the people doing rock polishing like using it. You can sometimes find it for about half the price from them.
google "vertex colonel brassy" and the first link that comes up is a bike shop recommending it.
Here's a shot of my bike (lots of chrome to clean):