Dan,
Are you trying to be totally correct with your car? I'll assume 14" wheels, as they were the only ones that had a brushed trim ring, I believe. The polished looks better(my humble opinion). IF you really want to go at polished rims with Scotchbrite, I imagine it would give you the look you want. Just leave the outer part of the trim ring alone, meaning the lip out by the tire.
Mike