HP N6350 - Manual (Page 35)

To clean the ADF, follow these steps:
1. Turn off the scanner and then disconnect the USB or Ethernet cable and power cable
from the scanner.
2. Open the scanner lid.
3. Clean the white strip on the inside of the scanner cover and the clear scanning strip
on the scanner bed. Wipe these items with a clean, damp, lint-free cloth.
Clean the automatic document feeder (ADF) 33