My launch day 32GB iPhone 5 has dust under the camera lens. It does not affect image quality or clarity, and the phone came this way out of the box. As I travel for a living, I have not had time to go to the store to replace the phone. With all the reports of scuffs, etc. , I am hesitant to return the phone since it is nearly perfect and has provided outstanding battery life (8HR+). Is there any way to clean this? If not, can I return the phone for a brand new phone in retail box, or must it be an exchange at the genius bar?