Is there nothing left to do?
I am trying to get rid of this pesky, persistent feed that is showing up old posts from when I had the domain years ago, plus new posts I've imported when I recently repurchased it.
I have deleted the entire database. I've inserted thousands of blank posts into the database, enough to cover any and every GUID I would have used.
I've created, resynced, and completely deleted feeds in feedburner.
And now I have deleted everything--the entire database--and uninstalled WordPress.
When I did this on another site, the feed completely disappeared.
But it is still there for this site. I don't know what there is left to do. Can anyone help me?