Glass beads knock it right off. It would have been better to just do that right from the start because all the cu would have been removed while it was still attached to the nickle and chrome. Separating the metals has just introduced more labor into the process. There is some slight copper wash that has remained but household ammonia and some bore cleaner will work that off. A quick polish on a muslin wheel would probably get me where I need to be once all that has been done.