Cleaning Inside the Printer (Bottom Plate Cleaning)
Remove stains from the inside of the printer. If the inside of the printer becomes dirty, printed paper may get dirty, so we recommend performing cleaning regularly.
You will need a sheet of A4 or Letter-sized plain paper*
* Be sure to use a new piece of paper.
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Make sure the printer is powered on.
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Remove any paper from the rear tray.
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Fold a single sheet of A4 or Letter-sized plain paper in half widthwise, then unfold the paper.
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Fold one side of the opened paper in another half, aligning the edge with the center crease, unfold the paper.
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Load only this sheet of paper on the rear tray so that the wider folding margin is put down with the opened surface (valley fold) upward.
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Pull out the paper output tray (A) and open the output tray extension (B).
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Press the Setup 
button until 8 appears on the LCD.
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Press the Black button or the Color button.
The paper cleans the inside of the printer as it feeds through the printer.
Check the folded parts of the ejected paper. If they are smudged with ink, perform Bottom Plate Cleaning again.
When performing Bottom Plate Cleaning again, be sure to use a new piece of paper.
If the problem is not resolved after performing cleaning again, the protrusions inside the printer may be stained. Wipe off any ink from the protrusions using a cotton swab or the like.
Be sure to turn off the power and unplug the power cord before cleaning the printer.
If your product issue was not resolved after following the steps above, or if you require additional help, please create or log in to your Canon Account to see your technical support options.
Or if you still need help, visit our Canon Community by clicking the button below to get answers:
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