Scantron OpScan 4ES Operator's Manual page 167

Operator's Guide
1.
Raise the covers for the read head and sheet
deflector and remove the printer cover.
2.
Spray canned air (with a non-condensing
propellant) directly on the transport bed area. This
removes large amounts of dust and other types of
debris.
Chapter 8: Cleaning the Scanner
Procedure
147