Canon TC-20 Online Manual page 385

Follow the same procedure for cleaning the inside of the left side of the printer as for cleaning the right
side.
11. 11. After wiping off the inside of the left side of the printer, select OK.
12. 12. Close the access cover on the left side of the printer.
If the printed document is still dirty after performing these operations, the part that cannot be wiped off may
be dirty. The dirt may be removed by passing a blank sheet of paper, so perform the following operations.
◦ ◦ If the roll paper is dirty, perform Set cut length several times.
Set cut length (feeds and cuts paper rolls by a specified length)
◦ ◦ If the sheet is dirty, perform Bottom Plate Cleaning.
Performing Bottom Plate Cleaning
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