|Many of us own LCD monitors or laptops. They tend to get dirty easily.
To clean the LCD screens, try a dampened soft cotton or non-abrasive cloth with a little water, and gently wipe down the screen. For heavier buildup, try adding a little vinegar to the water.
When cleaning, make sure your LCD is unplugged, and if you use a damp cloth, wait until the screen if completely dry before turning the set back on. Be sure to read your owner's manual or contact your LCD manufacturer to see what they recommend because some manufacturers may have other solutions not covered in this tip.
While it is good to clean your screen every now and then, LCD screens are not made for constant touching, so be careful when cleaning because you don't want to damage the pixels within the screen.Source [edited]