If you use Delete instead of the select it will not get the ids to remove the appropriate information.
It wont un-index the words from the search engine, or remove attachments. Leaving some more unclaimed stuff in your database.
I've not had a problem with the remove orpahn posts / threads on any of my test boards though this could be caused by hacks or any number of things.
If your still have problems try running the select query in phpmyadmin and see what it returns.
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