These references might help:

Factory reset for Canon MF8380C

Another is:

Factory reset for Canon i-SENSYS MF8580Cdw MF8550Cdn MF8540Cdn MF8280Cw MF8230Cn

Lastly, there is the User Guide but there doesn't seem to be a universal single-action factory reset (look at pages 37, 54, 80):

Canon ImageCLASS MF8580Cdw/MF8280Cw Basic Operation Guide

Hope that helps! :-)

These references might help (from Factory reset for Canon MF8380C ):

This was really hard, but I solved it after a bit of frustration...

Press "menu 2 8 menu" (menu is the head with the star, above no. 1 key)

Go to menu "COPIER->FUNCTION->CLEAR->ALL". Turn off the printer and on again. You will need to do all the settings again.

Maybe you can choose a specific item to reset, I was so frustrated so I cleared all ... Hope this will help you. Good luck!

Also, there is the User Guide but there doesn't seem to be a universal single-action factory reset (look at pages 37, 54, 80):

Canon ImageCLASS MF8580Cdw/MF8280Cw Basic Operation Guide

Hope that helps! :-)