Re: OT: Sad
You can use a dishwasher too. One of my friends picked up a bunch of old computers (486 thru PIIs) at a surplus auction or something. All the boards were coated in dust, so just put them in the dishwasher, started it up, and made sure to let them dry completely before plugging them back in. I would say "good as new", but really it just made them shiny and helped the ones that still ran to spread heat better.
And yeah, compressed air just gets cold when you let out a lot of it. Simple chemistry, ideal gas laws... PV=nRT, you change the P (pressure) so it is lower, and the only thing on the other side of the equation that can change is T (temperature). V (volume) stays the same, since that's the can itself.
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