Hello,
You can try removing the toner from the printer and check the toner loading area for any loose toner powder that you can wipe up with a damp cloth. While the toner is out of the printer, you can also check the toner cartridge to see if any of them are leaking.
After cleaning any loose toner powder and replacing any leaking toner cartridges, you can perform another set of cleaning for the ITB and fixing unit. If that does not resolve the issue, it looks like the printer needs service. In that situation, you can try contacting support over the phone or logging into your MyCanon account to check your service options.
