Ever wondered which is the easiest way?
Using the "configDefault --all" does not clear everything, for example it doesn't clear: system name, zoning, etc.
Setting the switch to AG mode (Access Gateway) - will clear more things as it basically dumbs down the switch, it does not remove the licenses, IP and password.
ag --modeenable ag --modedisable
The 'ag --modedisable' (puts switch back in normal switch mode) command sets the default zones access to No Access, so if you want to merge this switch into a fabric you'll most likely need to change that and disable/enable the E_Ports.
Quite often there are some good tips on the Brocade's community forum.