For the MG6220: You must reset the Ink absorber counter after cleaning.
1. Download ST_V3600_resetters.exe from Cannon
2. Turn off printer. Start the ST_V3600 on computer connected to printer
3. Holding down the stop button, press the on button. Keep both pressed
4. While holding the on button, press the stop button 5 times. Then release the On button.
5. When Power light is on, the machine is ready for service mode.
6. Run the Test page option from the ST_V3600_resetters.exe program.
7. After it completes, press the Set button by Ink Absorber Counter/ counter Value 0.
Turn off computer
(These instructions re in the MG6220 or MG5220 (almost correct) technical manuals)