Mac book pro - forget wifi network

After wiping my Mac book pro with SSD I discovered the recovery system still remembered my personal network.

To remove it, you to bring up terminal and type

networksetup -setairportnetwork [device] [network] [password]

To find out [device] type ifconfig and look for a local IP e.g. 192.168.1.67

Set a pass to dummy pass. E.g.

networksetup -setairportnetwork en0 'wifinetnamepriv' 'dummypass'

Give the system a little moment and then it will forget it self.