Canon S820 User Manual page 84

Routine Maintenance
3
Open the front cover, and wipe the interior of the printer with a dry cloth.
Wipe away any stray drops of ink, scraps of paper, and dust. Pay special
attention to cleaning the black panel that can easily become dirty. Do not
touch any of the printer's internal components, such as the Ink Absorber.
Warning
Do not use any flammable solvents such as paint thinner, benzene or
alcohol.
Ink Absorber
Black panel
Cleaning the Printer 84