After having switched to Docker all my development environment, I've realized that still have running all the dependencies of my previous environment like for instance Postgres.
I have like 30 packages installed and it looks longer to me to remove them one-by-one than removing all and re-installing the 2 or 3 that I'd like to keep.
Uninstall all the packages
The command is really simple:
$ brew remove --force --ignore-dependencies $(brew list)
That's all folks. :)