How to delete a Windows network route?

I have the following ipv4 route table, and I’m trying to delete the first line, but it just won’t let me, kept saying element not found. I’m trying to remove the first item with command
route delete 0.0.0.0 mask 0.0.0.0 172.30.10.12 or route delete 0.0.0.0 mask 0.0.0.0 172.20.10.1 if 26 or route delete 0.0.0.0 mask 0.0.0.0 172.20.10.12 if 26 All of them resulted in error of the route deletion failed element not found

IPv4 route table
===========================================================================
Active route:
Network Destination        Netmask         Gateway           Interface    metric
          0.0.0.0          0.0.0.0      172.30.10.1         172.30.10.12    35
          0.0.0.0          0.0.0.0      172.30.10.1         172.30.10.10    200
          0.0.0.0          0.0.0.0          On-Link       207.174.6.254   6
        127.0.0.0        255.0.0.0          On-Link         127.0.0.1    331
        127.0.0.1  255.255.255.255          On-Link         127.0.0.1    331