Epson WorkForce Pro WF-C5890 Wireless Color MFP Inkjet Printer - Manual (Page 285)

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5. Using the flashlight, check the translucent film shown here for ink smears.
1 Translucent film
2 Print head rail
Caution: Do not touch the print head rail or you may not be able to print. Do not wipe off the grease
on the rail.
6. Moisten a cotton swab with the water and detergent mixture and squeeze out any excess moisture,
then lightly wipe the ink off the translucent film.