Some say it's coming in from the earpiece, some say the headphone jack. Canned air seems to be the trick but I'm nervous as to where the dust goes when blown out from the camera.
Not sure if a vacuum would have enough suction.
Vacuum I'd assume could damage inside components. Can of air im sure would be the safest. From what I notice however is that the dust doesn't exactly mess any image up.
Sent from my Nokia Lumia 920 using Board Express