Camera dust

I got some dust particles on the inside of the lens :confused: which really annoys me. Due to this the camera does not focus correctly.

I really want to keep the phone waterproof so i am afraid to take it apart to clean it. Anyone experience similar issues or even swapped the backcover? Any recommendations for a backcover that ensures waterproof ability after swapping it?

thanks!

from xda-developers http://ift.tt/28QYaME
via IFTTT