Cisco Sanitization

Hey all! I'm currently creating a sanitization guide for all my hardware. When I got to my Cisco devices I noticed there are numerous ways to reset them back to the default and clear the NVRAM. Does anyone have a guide that includes sanitization information for all Cisco devices(at least switches, routers, IDS's, and ASA 5500 Series) so I don't have to recreate the wheel? Thanks, Tim