I am looking what is the best practices for DNS salvaging and can anyone point me in the right direction. Thank you. 

Do you mean scavenging. If yes, then below is the TechNet article that explains it http://technet.microsoft.com/en-us/library/cc771362(v=WS.10).aspx

• Edited by Ezzi AdnanMicrosoft employee 11 hours 36 minutes ago
• Proposed as answer by Ezzi AdnanMicrosoft employee 11 hours 0 minutes ago

Thank you Ezzi and to be clear i need to figure what is the best way to practice this safely and using this table below the default and best way to implement this instead of custom rules?

Service	Default refresh period
Net logon	24 hours
Clustering	24 hours
DHCP client	24 hours The DHCP Client service sends dynamic updates for the DNS records. This includes both computers that obtain a leased Internet Protocol (IP) address by using Dynamic Host Configuration Protocol (DHCP) and computers that are configured statically for TCP/IP.
DHCP server	Four days (half of the lease interval, which is eight days by default). Refresh attempts are made only by DHCP servers that are configured to perform DNS dynamic updates on behalf of their clients, for example, Windows 2000 Server DHCP servers and Windows Server 2003 DHCP servers. The period is based on the frequency in which DHCP clients renew their IP address leases with the server. Typically, this occurs when 50 percent of the scope lease time has elapsed. If the DNS default scope lease duration of eight days is used, the maximum refresh period for records that are updated by DHCP servers on behalf of clients is four days.

By default, the refresh interval is seven days. In most instances, this value is sufficient and does not need to be changed, unless any resource records in the zone are refreshed less often than once every seven days.

The recommendations as per the TechNet article are safe to implement. However I would recommend to go through this old thread

Recycling old threads. http://social.technet.microsoft.com/Forums/windowsserver/en-US/334973fd-52b4-49fc-b1d8-9403a9481392/dns-scavenging?forum=winserverDS

This thread discusses the best practices and also explains how you can enable DNS scavenging and monitor that the scavenging is doing its job.

• Marked as answer by tony869 10 hours 59 minutes ago

Awesome that is what i was looking for and have a nice weekend. :) :)