This document contains a procedure for cleaning the scanner glass.
caution:Use only glass cleaner. Avoid abrasives, acetone, benzene, and carbon tetrachloride, all of which can damage the scanner glass. Avoid isopropyl (rubbing) alcohol because it can leave streaks on the glass. Do not spray the glass cleaner directly on the glass. If too much glass cleaner is applied, the cleaner could run to the edges and damage the scanner.
note:To clean the inside, backside, and/or underside of the glass, have the scanner serviced by an HP technician.