Canon Color ImageRunner C3380 Reference Manual page 408

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Routine Cleaning
Clean the rollers (a total of three places) inside the inner cover
with a cloth dampened with water. Then, wipe the area with a
soft, dry cloth.
Clean the transparent plastic part of the inner cover with a
cloth dampened with water. Then, wipe the area with a soft,
dry cloth.
Close the inner cover.
CAUTION
When closing the inner cover, be careful not to get your fingers caught, as
this may result in personal injury.