Epson Stylus Pro 7800 User Manual page 309

If the back of the printout is soiled or if there is a serious
problem of dirt on the inside of the printer, clean it using a
soft, clean cloth dampened with mild detergent. Then, wipe
the inside of the printer dry with a dry, soft cloth.
3. If some powdery paper dust is stuffed in the platen, use
something like a toothpick to remove it. Close the front cover.
Maintenance and Transportation
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