How can I clean the scanner glass on my HP Officejet 6600?
To clean the scanner glass, turn off the printer, lift the lid, and use a soft, lint-free cloth sprayed with mild glass cleaner to wipe it. Dry the glass after cleaning with another dry cloth. Close the lid and restart the printer (Page 23).
From the official HP Officejet 6600 E All IN One Printer Series H711 manual, page 23
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