HP LaserJet Pro 400 MFP M425 - Manual (Page 197)

2. Use a moist, lint-free cloth to wipe both pickup
rollers and the separation pad to remove dirt.
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.
3. Close the document feeder cover.
ENWW Solve scan quality problems 181