User blog comment:Meighan/Wiki Wisdom: Reacting to Trolls and Vandalism/@comment-25129106-20111218130255/@comment-1903155-20111218172515

Also, if you want to delete revisions, either use someone from the deleterevision group, or follow a more complicated process.


 * 1) Delete the page
 * 2) Go to undelete
 * 3) Click select all revisions
 * 4) Uncheck the bad revisions
 * 5) Hit the undelete button

After that, only the appropriate revisions will appear in the page history to users without the sysop group.