Only one place in MD that i know that's willing to do automotive parts that's in the DC metro area. I haven't been there in over two years. They used to do chroming for Extreme motorsports. Expensive and turnaround is forever. Beware of a black guy that's near Woodbridge area that does polishing work out of his house. He's a total rip off.

Metro Plating & Polishing
4110 Howard Avenue
Kensington, MD 20895
http://www.metroplating.com
Details 301-493-4009
Toll-free: 800-938-5811

There is another place in Annapolis. I never been there but I have gotten quotes from them. Better prices than Metro but I never seen their work.

Annapolis Plating & Polishing
40 Hudson Street
Annapolis, MD 21401
http://www.annapolisplating.com
Details 410-573-1077