Make sure everything's good and you won't have anything hanging around on this machine. If you're using Cloud services like for Microsoft or Adobe make sure you are logged out of that. Go into Mail and make sure they're all gone. You can be signed in for things like Twitter, Facebook, etc. Under internet accounts make sure you've removed all your internet accounts. Go into System Preferences, make sure you've turned off all your iCloud services and you've removed your iCloud account. Look everywhere you can think of and sign out and delete accounts. For instance, look in Messages, look in FaceTime, look in iTunes, look in the App Store. So the first thing you want to do when doing that is make sure you are signed out of everything. You want to get all your stuff off there and give them a Mac that's just like new. This may happen if you're trying to resell it or pass it along to somebody else.
Video Transcript: Something that you may need to do from time to time is to completely clean off a Mac. Check out Erase and Completely Reset Your Mac at YouTube for closed captioning and more options.
