I am cleaning up my old computer to prep it for resale, which Apple seems to have made very difficult in Snow Leopard. I have removed all personal files, removed passwords from the keychain, reset the keychain, reset the admin user name & password, and completed a 7-pass erase of deleted files. Everything is clean. However, the authentication dialog is still autofilling my old user name. As I've deleted everything in the keychain & reset the admin user name, I'm not sure where it is pulling this from. Is there anyway to reset this? I have scoured the internet to no avail.