I stumbled upon a great Greasemonkey script for clearing your Facebook wall of all posts, of any type. It seems to work very well, so I recommend it to anyone looking to do some cleaning up without having to press the same buttons over and over a thousand times.

Install Greasemonkey for Firefox, restart the browser, then install the Clear ALL Facebook Activity (fixed) script.

A button should appear on your profile page when installed (refresh may be needed).

I updated the original creator’s script to work in the new Facebook profiles.

EDIT 2012.14.2: The script needs to be revised for the new Facebook “Timeline” profiles. I have attempted to make it work, but without success thus far. I might try again at a later time, but for now I have decided to scratch the project.