Canon PIXMA MP250 - Manual (Page 75)

Check the folded area of the ejected paper. If it is smudged with ink, perform the Bottom Plate Cleaning
again.
If the problem is not resolved after performing the Bottom Plate Cleaning twice, the protrusions inside the
machine may be stained.
See Cleaning the Protrusions inside the Machine to clean them.
Note
When performing the Bottom Plate Cleaning again, make sure to use a new piece of paper.
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Page 75 of 678 pages Cleaning the Inside of the Machine (Bottom Plate Cleaning)