When I orginally had this problem, I used "One-Touch Spam Ban and Cleanup"....
https://vborg.vbsupport.ru/showthread.php?t=156444
You'll have to go and clean up all of them one by one.... but this one kills all the post
everywhere (PM's, Posts...ect), I really like this one...
Now I use "vbStopForumSpam".... WOW..This is the best program ever.....
https://vborg.vbsupport.ru/showthread.php?t=222536