Seriously, I've tried all sorts of things to clean the dust outta my PC case I've got one of those "cooler cases" that's full of holes. Nice when it's clean but it gets hot as hell when it's choked with dust. I picked up an air compressor kit with some good blow gun bits and really have my PC case like new now. If you have dust in electronics problems like I do don't waste your time with those cans of propellant, I can blow harder than those with my own lungs. Pick up a cheap air compressor (mine was only $50) and the accessory kit $8. I ran around the house blasting years of dust out of everything this weekend. The cats stayed on the patio!