I've seen the insides of some computers that are dirtier than that one's.
In particular, I've witnessed huge dust bunnies that would fill up the empty spaces inside.
As for the outside, though, that beats anything I've seen, except perhaps for some computers in mechanics' garages that have really greasy keyboards.
Any public computer. If like me you like to eat munchies while you work / study, then a wipe of the keys is mandatory. 50% of people who go into washrooms never actually wash their hands after pissing / shitting...and damn, fuck if their the one swho used the computer before me.
I've seen professors-goddamn people that should be educated on the perils of public area-borne germs-just walk out of restrooms after taking a massive leak without even glancing in the sink's direction. I use a paper towel to open the restroom door when I'm finished now