Epson AcuLaser C9200 Series - Manual (Page 177)

2. Take out the exposure window cleaning bar.
3. Insert the exposure window cleaning bar into the hole under the photoconductor unit with its
sponge facing down, and then slide it in and out a few times.
Note:
Repeat the same procedure for the other photoconductor units.
EPSON AcuLaser C9200 Series User's Guide
Cleaning and Transporting the Printer 177