Yeah, I'd focus on prevention if that was an option. Unfortunately, it isn't because, firstly, its already dirty, and secondly, because I store it in my backpack, which basically means that I have to draw it up by the rubberized portion before I can take hold of the metal.
That said, thanks for the cleaning advice. I've had some degree of success using duct tape to remove the finger prints, but this mainly just makes them less obvious. I will have to try the rubbing alcohol solution out when I have the chance. How do you measure out the portions for the solution? I'd use kitchen measures, but I was under the impression that isopropyl was not something that humans should ever consume.
I'll also try the microfiber cloth solution. My microfiber cloth is more along the lines of what you'd use for glasses, but perhaps it will still work with breath to remove the smudges.