Canon MG6400 series Online Manual page 193

(8) Load only this sheet of paper in the front tray with the ridges of the
creases facing up and the edge of the half with no crease facing away
from you.
(9) Open the paper output tray gently, then press the OK button.
The paper cleans the inside of the machine as it feeds through the machine.
Check the folded parts of the ejected paper. If they are smudged with ink, perform
Bottom Plate Cleaning again.
(10) When the completion message appears, press the OK button.
The screen will return to the Maintenance screen.
If the problem is not resolved after performing cleaning again, the protrusions inside the
machine may be stained. Clean them according to instructions.
Cleaning the Protrusions inside the Machine
Note
Press the HOME button to exit Setup and display the HOME screen.
When performing Bottom Plate Cleaning again, be sure to use a new piece of paper.
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