Permanent marker, like ink, dries quickly on glass and plastic surfaces, including computer screens and LCD televisions. When cleaning a LCD TV, it is important to use light pressure and a cleaning solution that does not destroy the television's LCD surface. It is possible to remove permanent marker spots from a LCD TV using full-strength isopropyl alcohol. The alcohol is also known as rubbing alcohol and is available at drug stores as well as hardware stores.
Turn off your LCD television, if it is on. Wipe the LCD screen with a microfiber cloth to remove any loose dust and dirt from the screen. Wear latex gloves to keep your fingerprints off the screen.
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Apply 1 tbsp. of 70 percent isopropyl alcohol to a clean microfiber cloth. Wipe the permanent marker spot gently with the alcohol-soaked cloth.
Repeat Step 2 until the spot is completely gone from your LCD TV.
Mix 1/2 cup of isopropyl alcohol and 1/2 cup of cold water in a plastic or glass container. Dip the microfiber cloth in the mixture, wring out excess and wipe your LCD TV's screen from one side to the other side in one direction with the damp cloth to clean it and remove any remaining residue.
Fold the microfiber cloth you used in Step 1 and wipe the screen dry screen from one side to the other side in one direction.