I had to answer this question today… how to get rid of a POC environment that was living in a production AD DS? Ooopsie. Fail. The obvious stuff did not work, nor did reading the oh-so-helpful chm documentation.
Then I found this: http://terenceluk.blogspot.com/2011/01/step-by-step-instructions-for.html. Very nice. Worked. And also this:
and then there is this:
‘nuff said – use at your own discretion.