Hello I noticed 4 months ago that some marks made by keyboard appeared on the screen. Now there are more but i don't know why because I clean my screen and my keyboard everyday (no it's not the staingate problem ). What can I do preventing this problem to expand ? I don't mind the marks when the display it's off but I wonder if will notice them when it's on . It's there chance ? I know that this problem is often found on MBA's screens.