Ok So I recently bought a 'full body' invisible shield for my iPod Touch 2nd Gen and I installed and made sure I did everything right. So I let it dry for 24 Hours and almost all of the bubbles went away and it looked good so I started using it, but I noticed that there were smudge marks on the Outside of my screen not the sticky side! Anyways can some one tell me how to clean it Please! 
-Thanks in Advance
-Thanks in Advance