Clean the exterior, Clean the document feeder (some models only), An the exterior – HP ENVY Inspire 7255e All-in-One Color Printer with Free HP+ Upgrade Eligibility User Manual
Page 73: An the document feeder (some models only)

3.
Close the scanner lid, and turn on the printer.
Clean the exterior
WARNING!
Before cleaning the printer, turn the printer off by pressing the Power button
and
unplugging the power cord from the electrical socket.
Use a soft, damp, lint-free cloth to wipe dust, smudges, and stains off of the case. Keep fluids away from the
interior of the printer, as well as from the printer control panel.
Clean the document feeder (some models only)
If the document feeder picks up multiple pages or if it does not pick up plain paper, you can clean the rollers
and separator pad.
WARNING!
Before cleaning the printer, turn the printer off by pressing the Power button
and unplug
the power cord from the electrical socket.
1.
Remove all originals from the document feeder tray.
2.
Lift the document feeder cover.
This provides easy access to the rollers (1) and separator pad (2).
Clean the exterior
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