To clear the configuration of unnnecessary rules/translations, we do not have any tools, unfortunately that needs to be done manually by the user.At most what you can do is to run "show access-list" on ASA and chcek if there are any rules on which you don't have any hitcount for a long time or any network ACL which does not exist anymore.
Secondly, for ASA, here are the factory default password:
username - pix
Password - cisco
Enable mode password is blank, just hit enter for it.
Hope this helps.