I have a remote bare git repository.
A new developer cloned it, but he didn't have a properly configured .gitignore file, so he mistakenly pushed some unwanted files into the remote. When I pulled the changes and merged, I got these previously untracked files. Others have also pulled the changes from the remote and have these unwanted files as well.
How do I delete these files from the remote repository, and everyone else's remote/origin/branches?