Toshiba Satellite L640D Maintenance Manual page 240

Handling the LCD Module
3. If the panel's surface gets fingerprint or dust, put on gloves and wipe it with static
electricity cloth. If it is still dirty, drop some cleaning alcohol on the surface and
wipe it again.
If the surface is much more fingerprint or dust, we recommend a CRT cleaning agent.
Apply the agent to a cloth and then wipe the panel's surface. Do not apply cleanser
directly to the panel.
If dust still exists, please use ionic FAN which can avoid static electricity to deal with
it.
4. If water or other liquid is left on the panel's surface for a long period, it can change
the screen's tint or stain it. Be sure to quickly wipe off any liquid with cloth or ionic
FAN
5. Glass is used in the panel, so be careful not to drop it or let it strike a hard object,
which could cause breakage or cracks.
Satellite L600D/L640D/L645D, Satellite Pro L600D/Pro L640D/Pro L645D Maintenance Manual (960-Q08)