From my experience these are not marks from the keys being pushed into the screen. I believe that the marks that you are seeing are the residues left from your typing on the keys. Grease and dirt are then transfer to the screen when the laptop is closed. i have removed this marks simply by cleaning the screen. ***** Be very careful when cleaning because normal cleaners like windex will destroy your screen.****** I have used light pressure with a soft cloth and water. There are also special cleaners available in computer stores.