Delete/Reset OSX Mavericks Keychains

Local church inherited Macbook Pro with Mavericks 10.9.5

How do I delete/reset Keychain entries (especially login items) to clean start. I noticed message about 'Reset to Defaults', not sure where I saw this - Applicable here?

Church wants to see Mac as new / off the shelf.
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MARSPATHRetired EE/Computers/ITAsked:
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Kevin SimsJunior Network AdministratorCommented:
you can restore the computers to factory settings using the built in recovery assistant if you have the installation disk or if your connected to the internet or you can go to the link http://support.apple.com/kb/DL1433 and create one
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strungCommented:
You can delete keychains by right clicking on them in Keychain access and selecting DELETE.

If you want to reset the Mac to as new, you have several options.

The quick and dirty one is to create a new Admin user and delete all old users. This will leave your apps intact but you still might have some residual items in various caches, or in the desktop folder, or at the root of the hard drive. You can delete those separately and use something like ONYX ( http://www.titanium.free.fr/downloadonyx.php ) to delete the caches.

If you still have to original system disks that came with the Mac, the best way to restore to factory defaults is to boot from the system DVD (by booting while holding down the c key), then go to Disk Utility and choose Erase disk. Under security options choose the option that writes a single pass of zeros to the drive. Once the drive is erased, re-install the system software from the DVD and the computer is essentially back to the state it was when you purchased it.
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strungCommented:
The suggestion from Kevin Sims, above, will work only if your computer has OS 10.7 or newer installed. The recovery assistant obviates the need for a system DVD. Just boot into the recovery partition by booting while holding down Command-R and then follow the rest of the instructions as per my post above. Again, this works ONLY if you have OS 10.7 or newer installed.
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MARSPATHRetired EE/Computers/ITAuthor Commented:
Thanks for your continuing support
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