Clearing a port config?

This might be an easy one but I can't figure out how to clear an individual port config for example, I want to delete this port config:

interface ethernet 1/g1
dhcp l2relay
switchport mode trunk
switchport trunk allowed vlan add 100,200,300

I want interface ethernet 1/g1 to be as though I never configured it :-)

I looked a bit onine but nothing really turned up besides resetting it back to factory default.  I went into commands I used to set the port, "dhcp l2relay ?" but no joy as to a clue or tip on how to undo dhcp l2relay or wipe the individual port back to being unconfigured.

Thanks in advance!