BrentB,
On ScreenOS, for policy based VPN the procedure is as follows:
First, delete VPN policies.
Second, delete VPN configuration
Third, delete IKE gateway configuration
On ScreenOS, for route based VPN the procedure is as follows:
First, unbind VPN to tunnel interface
Second, delete VPN configuration
Third, delete IKE gateway configuration
Fourth, delete tunnel configuration
Thanks,
Cesar