Bronze Statues

I have three real nice and quite expensive bronze pieces. There a little old now, and I would like to get them polished so they look like they did when they were brand new. I was thinking of taking them to a jewelry store because they are experienced at cleaning gold and watches. But, these don't really need to be cleaned as much as they need to be polished to regain their original luster.

I fully understand this is a very unusual request, but if anybody has any ideas, I would surly appreciate it.

Thanks in advance.