Long before I ever used them to clean computer parts, I have used 1/2" wide (and smaller), long bristle badger
or black sable
paintbrushes, purchased specifically as cleaning/dusting tools at the local artist supply shop.
They get all the dust out without any risk of scratching....safe for even the most delicate parts. (safest, most effective way to clean very intricate fine Italian porcelain sculptures
The long handle and bristles makes it easy to get into places that you can't fit your hand. And the natural bristles are static free, as tinjaw mentioned.
Over time, they will save you a ton of money too, as they will give you more cleanings than the same price in compressed air. (I am a very frugal person)
Just make sure you buy it specifically for this purpose and not
use one that may have been used for paint or other substances. (this is very
Oh...and stay away from soft fluffy cosmetic brushes, even if they are natural hair. They do attract static and their hairs will break easily and get caught in things.