so i have a lumia 925 and i love it but as most of you know it gets blobs and streaks/lines over the screen after a while, my questions are: Is the streaks and lines and blobs on the glass or the screen inside the phone?, secondly if i replace the screen, how long does it take for the lines to come back again?, 3rdly, is there any ways of getting rid of the blobs or lines or any way of preventing it. does a screen protector hide this