Canon MG8100 series On-Screen Manual page 863

(A) Load the paper after unfolding it.
The paper cleans the inside of the machine as it feeds through the machine.
Check the folded part of the ejected paper. If it is smudged with ink, perform Bottom Plate Cleaning
again.
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
When performing Bottom Plate Cleaning again, be sure to use a new sheet of paper.
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