Simple way.. purchase any glass glint (glass cleaner) spray it on both cloth and screen and than scrub off, must spray more and more, means to say that screen must be wet the whole time. Remove it step by step in small portions. it will no damage any thing, but needs a good elbow grease. You can do it by your self it take time but all will be gone. Tried many times on my both rides Corolla and Cressida...