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It can sometimes be hard to get the touchscreen to be very clean where there is no dust on the screen, so the dust does not get trapped between the screen protector and screen. There are sometimes very small pieces of dust which gets trapped.
I think it would be easier to install a screen protector with a new smartphone/tablet, and in a clean room like a electronics factory where there is less dust in the air.
I think it would be easier to install a screen protector with a new smartphone/tablet, and in a clean room like a electronics factory where there is less dust in the air.