Canon imageRUNNER C3489 Reference Manual page 392

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Routine Cleaning
Grip the dust proof glass cleaner by its tab, and slowly pull
and push it back and forth inside the machine (five or six
times).
Clean the four locations as shown below. There are marks on the main unit that
indicate the cleaning locations. Check these marks when cleaning the dust proof
glass.
When you have finished cleaning the dust proof glass, gently
push the dust proof glass cleaner back onto the rear side of
the front cover.
Place the dust proof glass cleaner back on the rear side of the front cover with its
tip facing the left direction.
Close the front cover of the main unit.
CAUTION
When closing the front cover of the main unit, be careful not to get your
fingers caught, as this may result in personal injury.