incorrect DNS entries on server 2008 r2

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http://serverfault.com – On the main DC (windows server 2008 R2 standard) in our network I have to clear some old DNS entries every now and then in the Forward and Reverse Lookup Zones. I have set the server Aging/Scavenging settings to Scavenge stale resource records, with both the No-refresh interval and Refresh interval to 5 days. Every now and then I still have to log on to the sever and remove the old DNS entries for computers that are not part of the domain anymore or have been renamed. Is there a different (better) way to automatically remove these old entries? (HowTos)