I'm just posting to see if anyone else has experienced this:
1) Create new post.
2) Delete post after a period of time, from the "all posts" admin page.
3) Sitemap.xml (from Wordpress SEO Plugin) Super-Cached page still has deleted post in it the next morning.
I have "Clear all cache files when a post or page is published or updated." checked, so I assumed the site cache would be cleared.