Well, beat 100% of the game. Or play free mode. Or have fun with it! When I play Sly Cooper, i pretend someone is chasing me and I need to get to the hologram as fast as possible.
Breath on it and rub it on your shirt, if that doesnt work try cleaning it with a wet substance and rub it with a soft material. If that doesnt work, take it to a gamestore and have the scratches...