I would be worried about the static electricity that might go along for the ride. (I suspect that the risk is relatively small to a mb installed and grounded inside a case.) Compressed air from a can should be much safer, albeit more expensive. Personally, I would prefer just to blow the dust off rather than subject the pc to risk. After all, for most computers the dust is not going to be that big of a problem. A good lungs' puff gets rid of most of it. (The CPU is the part most prone to overheating, and it has a heat-sink and fan on it, so dust is not a problem; the video card and chipset may be hurt a little by dust, I suppose.) Has anybody had a computer that overheated and was cured simply by giving it a good cleaning?? Dean Kukral ----- Original Message ----- From: Dale Mentzer Sent: Thursday, June 23, 2005 6:22 PM Hi listers, I recycle a lot of old PC stuff and cleaning is a part of almost every box I acquire. I have a small canister style vacuum and use it with the hose attached to the exhaust fitting and the crevice tool on the other end of the hose. I also find a 3" or 4" new clean paintbrush to be ideal for fans and heatsinks. The vacuum is a lot cheaper than the canned air. If it is not too obvious to say this, you should do this kind of work outdoors. Regards, Dale Mentzer PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>