Rob Church wrote:
The best it gets is:
1. Delete the article
2. Go to the undeletion page for said article
3. Uncheck all the revisions which aren't spam
4. Click the Restore button
MediaWiki contains no functionality to permanently delete old
revisions of any article.
5/ never do that on an article with a lot of revisions (aka 1000+), ask
a developer instead.
--
Ashar Voultoiz - WP++++
http://en.wikipedia.org/wiki/User:Hashar
http://www.livejournal.com/community/wikitech/
IM: hashar(a)jabber.org ICQ: 15325080