Canon PIXMA MG4200 Series On-Screen Manual page 524

When the dialog opens, select the ink group for which deep cleaning is to be performed.
Click Initial Check Items to display the items you need to check before performing deep cleaning.
3.
Execute deep cleaning
Make sure that the machine is on and then click OK.
Click OK when the confirmation message appears.
Print head deep cleaning starts.
4.
Complete deep cleaning
The Nozzle Check dialog opens after the confirmation message.
5.
Check the results
To check whether the print quality has improved, click Print Check Pattern. To cancel the check
process, click Cancel.
Important
Deep Cleaning consumes a larger amount of ink than Cleaning.
Cleaning the print head frequently will rapidly deplete your printer's ink supply. Consequently, perform
cleaning only when necessary.
Note
If there is no sign of improvement after Deep Cleaning, switch off the machine, wait 24 hours, and
then perform Deep Cleaning again. If there is still no sign of improvement, see
Related Topic
Use Your Computer to Print a Nozzle Check Pattern
"Ink Is Not Ejected."
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