If you want to reset one or all of your APIC Controllers to factory default, there is a easy command for that ‘eraseconfig setup’

→ ssh admin@10.127.129.50
Application Policy Infrastructure Controller
admin@10.127.129.50's password:
apic1# bash ---> Only required with Version 1.2+

admin@apic1:~> eraseconfig setup
Do you want to cleanup the initial setup data? The system will be REBOOTED. (Y/n):

When your intention is to reset a whole fabric, it’s recommended to reset the switches first:
Reset a ACI Spine/Leaf Switch
If you reset the APIC Controller first, you have to do this step through console afterwards.