How do I clean the paper path to fix specks or marks on printed output?
Press the Setup button, go to the Service menu, and select Cleaning Page. When prompted, load plain Letter or A4 paper in Tray 1 and press the OK button to begin the cleaning process. Wait until the process completes, then discard the page that prints.
From the official HP Laserjet Pro M1536 Multifunction Printer manual, page 30
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