I've never heard of nickle plated chrome? Do you mean chrome plate? Not to be in any way rude, but maybe Cary will have the very best advice?
Probably the best advice I can give if this is indeed just chrome plated metal of some sort, is to use something like a liquid spray guitar polish, something that contains absolutely no abrasives in it. All these usually are is a mild wax, leave very little if any dust, and since they won't scratch paint finishes, doubtful it will hurt the chrome finish, but will help removing dirt, grunge, fingerprints. Mark