I've had my rMBP for over a year now, and I feel it could use a fresh install. It came with Mountain Lion, and now i've upgraded to Mavericks. Does anyone know where the proper directions for this process are located? I think I have to install to a USB stick for the fresh install and complete wipe, but how does that work if the computer came with Mountain Lion, and isn't the Mavericks download on the app store only an upgrade version? Or do I somehow reinstall Mountain Lion and then just reupgrade to Mavericks from the app store? Honestly just really confused on what to do, if anyone know how to do this properly i'd be very grateful.