Blue sticker is to remove any stain, hair, dust & finger print from the screen before put on the screen protector. It is also to remove any static charge from the screen so dust will no attract and stick on the screen, so can put on the screen protector easily. The blue sticker is must use before put on the SP.

How to use? Stick the blue sticker, then remove quickly, stick again, remove again, stick again...repeat until cover entire screen, then only put on you SP.

In case still got dust trap in side the SP, slikely take up the SP, you will see the dust stick on SP, you can use blue sticker to stick up the dust from SP, then put back you SP. DONE!!