Canon DR-5010C - Manual (Page 65)

Regular Maintenance 63
2.
Use a clean, dry cloth to wipe dirt off the sensor glass.
Wipe both the top and bottom sensor glasses.
CAUTION
Do not use spray type cleaners to clean the scanner. Precision
mechanisms, such as the light source, may get wet which will
cause a malfunction.
IMPORTANT
Scratches on the sensor glass may cause marks on the images and could cause
feeding errors. If there are scratches on the sensor glass, contact your local
authorized Canon dealer or service representative to replace the sensor glass.
3.
Wipe the rollers with a firmly wrung cloth moistened with water.
Guide Board
CAUTION
Do not use detergent to clean the rollers, since any detergent on
the rollers, could cause a feeding error.