Hey Sal - my 2 cents, if they don't visually have anything wrong with them, I'd keep them, but if you look at them and can tell something got on them I would change them. If you do change them, I would order new mangan strings, because you'll feel better about it - and just thinking out loud, if you don't use the martins, you can just send them up to me and I'll take them off your hands 🙂