Does anyone know how to clean Edison Price unplated copper posts? I used to use a refrigerant with 3% HCl, and it did the job. I can't get it any more, and every cleaner I've tried since (vinegar, vinegar salt past, Lysol bowl cleaner, etc) cleans nicely, but in a few weeks corrosion returns with a vengeance. With my old cleaner, the posts would just darken with time. Now they get heavy deposits of blue salt. It's as if the post is breaking down chemically, maybe from using that Lysol stuff, which is 7% HCl. Any ideas?