Dell Latitude L400 - Manual (Page 80)

If the touch pad or display become smudged from use, it can be cleaned using a soft, clean cloth slightly dampened with water. Always turn off the
computer before cleaning the display or touch pad.
To clean the touch pad, stroke the cloth gently across the surface of the touch pad. Do not allow water from the cloth to seep between the touch pad
and the top cover of the computer.
To clean the display, stroke the cloth across the display in one direction, moving from the top of the display to the bottom.
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