If I understand your question, you have some IP's that you used a static route that placed any packets that were trying to get to them into the vapor. To remove, Look at the config for a route that points to interface null 0 and remove it. Should look for entry like:
ip route 10.10.10.0 255.255.255.0 inter null 0
change to
no ip route 10.10.10.0 255.255.0 interface null 0
good luck