I'm trying to solve indexation issues for a high volume, high churn classifieds site. The trouble I'm running in to is that Google keeps a lot of the advertised goods on the site in its index long after the goods have been solved/the ad has been removed.
Can I solve this by telling search engines not to cache the page? (Using this meta tag: <META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">)
Or does that hurt the rankings of individual adverts on the classifieds site?