How to use the NT cleanup kit:

0) Launch the WebObjects uninstaller (called "Uninstall WebObjects" in the WebObjects program group) and reboot the machine after the uninstaller finishes.
1) Copy the NT cleanup kit to the machine's local drive.
2) From NT Explorer, launch sh.exe from the new NTCleanupKit folder on the local drive.
3) At the Bourne shell prompt, type: ./sh cleanup.sh
4) Verify that nothing unexpected failed during this process.
5) Reboot your machine.
6) Manually clean anything that you want off of the filesystem (e.g. NEXT_ROOT, cgi-bin/WebObjects*, doc-root/WebObjects, TEMP/WebObjects*).

Your NT machine's environment and registry should be totally clean of any WebObjects cruft at this point.

Note that this presumes that you've installed WebObjects by itself.  Uninstallation for installs of WebObjects on top of OpenStep are not supported.