I'm sure this has come up a bunch of times, but not from my particular concern, so I thought I'd put it out there. I'm considering ditching the case and having my 4s live in it's brithday suit (I've already broken myself of the InvisiShield habit), as it is a pretty sexy peice of hardware and I don't like hiding it, and what I'm wondering is this; I'm not too concerned about dropping or scratching it, as I've dropped a phone maybe twice in my life, but what about the metal bands? I'm worried that the oils in my skin may eventually discolor them or something... is this even possible? Thanks!