Epson WF-M21000 Series User Manual page 209

Maintaining the Printer
Important:
c
Never use alcohol or thinner to clean the printer. These chemicals can damage the printer.
1. Open the document cover.
2. Take the cleaning cloth from the cleaning cloth holder.
3. Use the cleaning cloth to clean the surface of the scanner glass.
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Improving Print, Copy, Scan, and Fax Quality
209
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Cleaning the Scanner Glass