At one of the shops that I worked at, we used an air compressor with spray nozzle attachment. Most of the canned air that you get is cheap crap and won't blow dust off a newly pledge dusted wood furniture.
I also agree about the sleep mode. Just shut off the computer if you don't use it for a while or just the monitor to protect from "burn in". Usually you have to reboot the computer after those two modes anyway because it takes a while after the intial wake up for the computer to go...Oh...now you want to use me...you'll have to wait for my programs to realize it also.
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