How to remove cached credentials from Git?

I ran:

$ git config credential.helper store

And then:

$ git push origin master

After pushing, I entered my credentials and they were saved.
I read that they are stored in plaintext, and so now I want to remove my credentials from being saved and entered by default.

How can I do this?

Run the following command in the terminal to remove your credentials stored in the cache

git config --global --unset credential.helper

Your credentials are stored in the file you (or the thing using git credential-store) specified when you (or it) ran the command, as described in the documentation. The default is $HOME/.git-credentials. You should be able to open this file in your editor and edit it, or simply remove it entirely.

Note that you may also want to change the credential helper so that these are not stored again. See the git credential-cache documentation as well, for instance.