I have only had my WK 6600 for just over a week and despite treating it tenderly there are fine scratches all over the display screen even in areas I have never touched. I would like to tell Casio that I am truly disappointed that they chose such cheap material in a much used area. Even fine computer cloths or the softest brushes cause scratching. I am afraid to go near the area . But it does collect a lot of dust. Have others found this same problem? I do not believe there is any way to remove these fine scratches.