Did you have anything under the glass I did it in the bathroom and I was careful and still had something under it I took it off I ordered two more waiting for them. I have ocd if one thing is under it I am done off it comes.
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I found a super easy way to rid your device of dust before applying a screen protector. Order a Armor Shield from Amazon and apply it first. Those screen protectors pick up every last piece of dust and it is basically permanently stuck to the screen protector due to the type of adhesive they use. After that, you can install your chosen screen protector on a nice clean screen without issue. I did it with my Nexus 6 before I put my screen protector on and it went on perfect the first try without a single piece of dust. You have to spend an extra $10 to do it this way, but it's well worth it to know all your dust problems will be a thing of the past. As a bonus, you'll get a very nice squeegee out of it as the one Armor Shield includes is a very high quality one.