How to Remove all Autodesk Products to Ensure a Clean Install

This happens once in a while: You try to install an autodesk product and it says you must rmeove all software first. Add/Remove Programs doesn't seme to do it. What's next?

Autodesk has produced a white paper on the subject here:

http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=2887771&linkID=9240617