This is a common household item that many people use to clean windows. However, this can be extremely damaging to the LCD screen on your laptop and you should never attempt it. It will leave behind a sticky residue that is hard to remove completely from the screen which could lead to colour distortion or other problems with viewing what's on your computer. It is suggested that you can index only if your laptop screen is made up of glass. This is also backed up by HP.com stating that Windex can be used with glass screen laptops.