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I understand hydrochloric acid will only dissolve the zinc from brass not the copper. It's a relatively slow process and only involves the surface, hence considered a safe(ish) way to remove chrome. I would protect the internal threaded parts though. With timely removal from acid, a good rinse with soap and water and a machine polish you should have shiny brass finish. I would be tempted to use dedicated as on image link below. Frosts also sell Incralac.