What's the Way to clean out my mac ahead of giving it out? I recently got a retina MBP and I would like to give my former MBP to my sister, How do I clean it out the "Apple way" rather than just manually deleting all my files. I would prefer if it ran smoothly like a new MBP to give her the full "Mac welcome experience" Are there steps for this? I have already migrated all my info to my new one.
To give it a full fresh and clean and welcome experience I would suggest you remove all stuff accumulated over time including all non apple aps.

To do that you can erase all the information from hard drive and simply reinstall the OS X.

Apple's knowledge base article has the steps: 


OS X Lion: Erase and reinstall Mac OS X - http://support.apple.com/kb/PH4439.


On most computers, the erase and install takes 30 minutes plus how ever long it takes to download the installer package from Apple's servers. That part is about a 4 GB download if you haven't saved it and follow the above instructions.