When the inside of your Pixma printer gets dirty, it can smudge the paper. Here&#39;s an easy way to get the inside of the Pixma printer cleaned out. First, fold a blank letter-sized piece of paper in half, and then unfold it again.Load the paper into the auto-sheet feeder.Press the Copy button.Press Menu repeatedly until the display shows 4. Maintenance.Press the arrow keys until Bottom Cleaning is selected. Press OK to feed the paper into the machine. If it comes out dirty, repeat the process once more.