Question : Resetting a 3600 Cisco Router to Factory Defaults

I need to make sure I clear all information off my cisco router so how do I reset it to factory default? or is there an other way?

Answer : Resetting a 3600 Cisco Router to Factory Defaults

If you able to login you need only this:

erase startup
reload

if you not hava password you need password recovery:
http://www.cisco.com/en/US/products/hw/routers/ps274/products_password_recovery09186a0080094774.shtml

Best regards,
Istvan