I know there is a thread here, but I tried using a compressed air duster and lots of other stuff, and it didn't work. Some help please? Thanks.
Taking it back to point of purchase for a replacement is probably your best bet.
I've had 2 and they're both like it. I'm just gonna put up with it, they're probably all the same. Blow through with an air line / compressed air
Seriously, get it replaced. You shouldn't have to put up with dust under the screen.
It's not worth it to switch for a new one. How often will you be using your front camera anyway? The only purpose of it would be to take pictures of yourself or to Skype. If there were issues of dust being in the back camera, then that's a problem.
I am on my second replacement for this exact issue. Phone #3 is starting to exhibit dust in the FFC too. This is a design flaw inherent to the 920.