Clean your LCD screen
Many are familiar in cleaning the screen using a watered damp cloth. But in order to clean deeper dirt, such as finger prints, food stains (hopefully not), dried wet spots, and more, use a different mixture – half and half combination of 70% Isopropyl alcohol and water. While the computer is off, lightly spray a cloth and clean the screen. This method is not suggested by the likes of Apple, so please use at your own discretion and try to refrain from actually touching the screen with your hands.