Oce WP28 Operation Manual page 146

3
Attach the grid cleaner to the printer with the pad at the top, as
shown in the figure.
4
Making sure that the charger roller does not come into contact with
the grid cleaner pad, repeat a few times the action of slowly pulling
out and pushing back in the charger unit, as shown in the figure.
This cleans grid part underneath the charger unit.
Do not push the charger unit all the way in. Otherwise, water from the
pad will cause the charger unit to become wet and this may affect
printing.
Note
Charger Unit
3-11
Cleaning
Grid Cleaner
Charger Roller