How can I restore out of box configuration on Cisco device?

Hello,
The new Cisco devices (routers and switches) are coming with some default (out of box) configuration, but not without configuration, not with blank configuration.
I realized that there is some command that can restore thе default configuration. But I can't find it.
What is this command? Anyone does it know?
Thanks in advance!
Best Regards,
Tsvety

Mike's suggestion was correct. I would only add that one needs to erase vlan.dat if you have a switch that was used elsewhere. Cisco procedure linked here (for switches) and here (for routers).
Even a brand new factory-fresh box will have SOME configuration bits on it. A skeleton configuration - the default VLAN 1, empty interface definitions, etc. will always be there. The only way to remove everything would be to erase flash altogether forcing one to boot in rommon (not very useful).

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