After a paper jam, I've also noticed blurry, squiggly lines. I did not remove it aggressively and removed it from the bottom. I saw another question regarding the same thing.
So that the Community can help you better, we need to know exactly which Canon printer model you're using and what PC operating system you are using as well (i.e. MacOS 14 Sonoma, Windows 11, etc). That, and any other details you'd like to give will help the Community better understand your issue!
