HP Color LaserJet Enterprise CM4540 MFP series - Manual (Page 301)

3. Clean the scanner glass and the white plastic
backing with a soft cloth or sponge that has
been moistened with nonabrasive glass
cleaner. Dry the glass and white plastic
backing with a chamois or a cellulose sponge
to prevent spotting.
CAUTION: Do not use abrasives, acetone,
benzene, ammonia, ethyl alcohol, or carbon
tetrachloride on any part of the product; these
can damage the product. Do not place liquids
directly on the glass or platen. They might seep
and damage the product.
NOTE: Carefully clean the small glass strip
to the left of the scanner glass. Small marks on
this glass result in streaks on copies made from
the document feeder.
4. Plug in the product, and then use the power
switch to turn on the product.
ENWW Clean the product 281