It is safe to clean an LCD TV screen with a dry, lint-free cloth, using very gentle circular motions. A slightly damp microfiber cloth can help remove smudges or fingerprints. A small amount of mild detergent is safe to add to the water.
Unplugging the LCD TV before cleaning it avoids the risk of electrical shock. It is also easier to see the marks and smudges on the screen when it is completely dark.
Chemicals in cleaning products may damage or discolor the LCD screen. Pressing hard on the screen can damage pixels in the TV. Likewise, rough cloth or sharp objects such as fingernails can scratch the delicate screen.