Hehe, I read the guy say "turn on the sink" and I was thinking "uh oh" until he mentioned the cloth, LOL
Reminds me of the time (I read about it in some Macintosh power user book, from OS 8ish), when the new Mac LC's came out with the CD drive, and some guy called Apple because he "broke his cup holder" after it popped open and he tried to place his coffee there. The Apple technician told him to box up his entire computer and send it back to Apple. The guy said, "Is it that bad?" To which the response was, "No, your just too stupid to own a computer". It's my understanding that the Apple Tech got fired, but lol!
Anyway, yeah, I'd definitely run the MacBook under cold tap water for a couple of minutes, wash all the viruses out. Kidding.
One thing I would do (I haven't owned a recent MacBook, but I'm to assume it's like previous models and like recent PC laptops), is open the bottom cover (remove the screws, pop 'er off), and remove any retaining screws holding the fan in. Gently lift out the fan, and clean out the exit where the air blows out of the fan (you wouldn't believe how much gunk gets in there), and blow over the heatsink with canned air or just a nice big breath! No matter what type of cleaning your talking about, if you've owned it long enough to start thinking about doing that sort of stuff, I'd do it. I do it on mine once every couple of months. (I use an Acer Windows laptop, and luckily, the cover that covers up the ram also extends back to allow access to the cooling fan for just that. Smart thinking Acer!)