Montblack wrote:

How does one do this ...remove old posts and erase evidence?

Curious.

You could send out a *kill request* but not all servers honor it and
typically it only works on your own if you catch the message before it
propagates. Groups.Google.Com will remove your posts if requested to do
so from its archives. They won't remove the replies to your posts
however. If you don't want your posts archived put the following at the
beginning of each message: "X-No-Archive" without the quotes of course.
Keep in mind that replies to your X-NO posts will get archived
however... This is a holdover from Deja News who Google bought...