Hi, I am trying to cleanse a news website.  When this website was first made, the people that set it up copied all kinds of articles they had as a newspaper, including tests, internal communication, and drafts.  This site has lots of junk, but this kind of junk was on the initial backup, aka before 1st-June-2012.  So, removing all mixed content prior to that date, we can have pure articles starting June 1st, 2012! Therefore My dynamic sitemap now contains only articles with release date between 1st-June-2012 and now Any article that has release date prior to 1st-June-2012 returns a custom 404 page with "noindex" metatag, instead of the actual content of the article. The question is how I can remove from the google index all this junk as fast as possible that is not on the site anymore, but still appears in google results? I know that for individual URLs I need to request removal from this link
https://www.google.com/webmasters/tools/removals The problem is doing this in bulk, as there are tens of thousands of URLs I want to remove.  Should I put the articles back to the sitemap so the search engines crawl the sitemap and see all the 404?  I believe this is very wrong.  As far as I know this will cause problems because search engines will try to access non existent content that is declared as existent by the sitemap, and return errors on the webmasters tools. Should I submit a DELETED ITEMS SITEMAP using the <expires>tag? I think this is for custom search engines only, and not for the generic google search engine.
https://developers.google.com/custom-search/docs/indexing#on-demand-indexing</expires> The site unfortunatelly doesn't use any kind of "folder" hierarchy in its URLs, but instead the ugly GET params, and a kind of folder based pattern is impossible since all articles (removed junk and actual articles) are of the form:
http://www.example.com/docid=123456 So, how can I bulk remove from the google index all the junk... relatively fast?