How to get rid of Postgres.app completely?

Previously i had Postgres.app installed on my Mac. Just out of convenience.

Now i want to go over to homebrew, but it seems to mbeimpossible to get rid of all the Postgres.app traces it leaves behind when you uninstall it.

Lots of Python modules (i use PL/Python) contine to want to compile against the Postgres.app libraries instead of against the homebrew libraries. And that is a problem if you have already removed Postgres.app

Anybody know where the last traces of Postgres.app are located and how to remove them so i have a clean homebrew Postgres, PL/Python/venv environment to work with?