The iPod wouldn't charge so I decided to open it up and saw what I believe is corrosion. Can anyone confirm? Also, if you notice, the screw on the right is brown so is that rust? Sorry for the quality, I took it from my phone. Also, I kinda cracked the glass (digitizer?) whilst opening it. Is there any difference between the $15 on eBay or $75 on ifixit? Thanks... *edit* Ohh! If that is corrosion, whats the best way to clean it? Alcohol swabs?