Removing Sticker Residue from a MacBook Air (or another laptop)

I like putting stickers on my laptops, to make them a little more personal. But I hate removing the inevitable sticker residue after peeling off stickers before I sell or pass on my old laptop.

In this video, I'll show you my current best technique for getting residue off most metal and hard plastic surfaces:

Let me know if you know of any better ways that won't mar the surface or take hours!