How to completely uninstall rails 3.0.0.beta3 and all its dependencies?

Question

If I do sudo gem uninstall rails -v 3.0.0.beta3, it uninstalls rails but leaves the beta3 versions of activerecord, actionmailer, etc. How do I completely uninstall rails 3.0.0.beta3 and all its dependencies automatically? I would like a clean slate for the RC and final releases.

Answer 1

$ gem list
...
$ sudo gem uninstall {gem-you-don't-want} {version-you-don't-want}
$ {rinse-and-repeat}