Toshiba Satellite U400 Maintenance Manual page 219

3. If the panel's surface gets dirty, wipe it with cotton or a soft cloth. If it is still dirty,
try breathing on the surface to create a light condensate and wipe it again.
If the surface is very dirty, 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.
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.
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Satellite U400/Satellite Pro U400/PORTEGE M800 Maintenance Manual
Handling the LCD Module