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If the compressed air gasses you reccommend & use in this tech industry by the experts, are dangerous to inhale, why are you not reccommending their spray & the crud within the dust they move out of the pc, be directed to a vaccuum or air cleaner inlet instead of promoting indoor air pollution? Why no promotion of designed for computer vaccuum gadgets?

I would also recommend using a non-conducting object to hold any fans still during spraying. A toothpick or plastic pin works to prevent the CPU Heatsink fan, PWR supply fan, and any other fan from over revs during cleaning. Compressed air will spin a fan far beyond it's designed speed, and while it looks cool as heck, can destroy the fan.

It might also be good to emphasize why you don't want to use a vacuum cleaner to remove dust. The reason is that vacuum cleaner tubes are usually made of plastic and air moving across the plastic builds up a static charge. If this charge comes in contact with the motherboard or other static-sensitive device inside the chassis, the device can be destroyed.

I take computers outside and then blow them out with compressed air which seems to work well.

the most handy thing I have is a air pump w/hose designed to blow up an air mattress I use it instead of canned air its dry air and with nozzle changes can be made as powerful as needed. yes I know there is a chance of a static charge building up , I give this some thought and come back with a solution

I was a PC Tech for over 20 years. You never use canned air to clean a system! Always used a professional PC canister vacuum with a stage five filter system to suck out the dust. With the right PC-sized tools even the toughest dust clogs can be cleaned. A small nylon paint brush or two was handy to work from both sides with the vacuum running on one side while you loosened the dust from the other. Bravo for correctly first talking about electro static discharge (ESD)protection. If you must remain on a rug, keep the power cord plugged in and actively use a grounding strap. ESD is the most common form of component failure. That and not being powered through a proper surge protection device such as those from American Power Conversion (APC). I used to buy all my cleaning supplies from URI who carried lint-less swabs and patches. Be sure to clean the contact edges of peripheral boards as well as RAM and check for proper seating upon replacement.