Hi, is there any way to tell if I have a screen protector on?
Basically I used displex touchscreen polish, but want to reapply it because doesn't look that good.

But here's the dull part, I must of put it on that good I cannot even see or feel it at all, I have even tried to use a really small screwdriver with a thin head to lift the protector up.

How easily can they fall off? I am now doubting that I even put it on (when I know I did put it on...).
It is literally invisible and invincible. I have scratched the lower corner now trying to get the protector off, so doubting its there. Any way to get it off.