Epson AcuLaser CX37DN Series User Manual page 201

11. Pull out the tray 2.
12. Return the laser lens cleaning tool to its holder on the inside of the tray 2.
13. Close the cover.
14. Close the tray 2.
15. Clean between each of the laser lenses in the same way.
Note:
The laser lens cleaning tool is included with the machine.
Safely store the laser lens cleaning tool so that it will not be lost.
Epson AcuLaser CX37 Series Printer/Copier/Scanner User's Guide
Maintenance 201