What is the correct way to remove cassowary from my system?

I removed some components, but there are a lot of errors popping up in my journalctl from cassowary, so there seems to be some parts in the system left

What steps need to be done to completely remove cassowary from my system and revert the changes made to virt manager/QEMU?

Eventually I would like to start with a fresh install but before would like to completely remove things