IBM ThinkPad 340 Series Hardware Maintenance Manual page 286

Caring for the LCD
When cleaning of the LCD becomes necessary,
gently wipe the LCD with a dry, soft cloth. Do
not use alcohol or detergent to clean the LCD.
To avoid damaging the LCD, do not scratch or
apply any force to its surface.
Do not put anything on the surface of the LCD.
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IBM Mobile Systems HMM