I'm not sure if this is available to the public but screen 'pit-fill' is the only thing to sort the tiny surface chips. You apply the resin to the screen, cover it with screen film and then let it cure with UV light, the excess resin is then scapped off using a new razor blade. For best results with regards to cleaning the screen though is like Nev described and that's by using clay, any stubborn 'baked on' marks will respond to a going over with a blade too. As far as scratch removal goes though i believe this was banned on windscreens due to distorting the screen. I am in the refurb business and we are not allowed to use this method. Hope this helps.