If you have an air compressor, you can put on a small attachment and use that to blow dust and debris out of your computer. Much cheaper than using the cans of compressed air. Just make sure that if you use a compressor, don't have the pressure so great that you cause damage, as some of the more powerful air compressors can.
If you use a compressor, it would help if you had a "dryer" in line to remove the moisture. At least dont hit the motherboard with the initial blast of air. Hold the fans still as you gently blow them.
I would not recommend using a vacuum cleaner due to static.
The speed of air movement past the nozzle can create a static chage will has to go some where to earth. Something could get fried by this static charge
If I used a vacuum cleaner I would make an earth connection at the nozzle to discharge any static charge build-up. Or simply connect my anti static strap at the nozzle.
A soft brush is top of my list
Compressed air is OK but needs care to avoid blowing the dust into disk drives
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