You can
clean the ADF if you see lines or streaks in your copies or scanned
images.
Caution:
Do not use a hard brush, alcohol, or
paint thinner to clean the product or you may damage it. Do not use
oil or other lubricants inside the product or let water get inside
it.
If a black line appears when
copying from the ADF, location B in the following image may be
dirty. Place the marked copy (A) on the scanner glass and clean the
portion of the glass that lines up with the black line. Clean the
same location on the underside of the ADF as well.