[Insoc]

I use a large roll of packing tape.

I remove the screen protector and place the side that goes on the screen on the tape. The tape removes any of the lint/dust on the SP. Once you are sure the screen is perfectly clean, peel the SP off the tape and reapply to the phone. Works a charm for me, but I am not responsible for the type of tape you use. Mine is clear no brand name packing tape on a blue plastic roll...

Good Luck!