Looking for a brain to pick...I have recently acquired a couple of old zither-like instruments (mandolin-harp and ukelin), and I still have two old autoharps that are just short of being playable. Is there a folk-remedy or high-tech way to clean old strings in a case like this where you'd really rather not replace them if possible. Also is there a source for piano wire that might be more cost-effective than buying "sets" of autoharp strings? I'd appreciate any suggestions.Chet