Here are some things that I observe when doing so:
- Avoid possible static discharge towards your machine.
Our body releases static electricity that might cause serious problem to your machine. There is a tool used to solve this it's some sort of a bracelet in which you attach one end to a metal (or to the case of your system unit). This would channel your static electricity towards the metal. I don't personally use this though. Holding every once in awhile to a metal attached to the ground should do the trick.
- Never detach the fan covering the CPU if you are not that sure with what you are doing.
Doing this improperly might cause serious problem to your CPU so rather leave it to the experts. On the other hand, if you are sure of what you are doing, then go ahead. If you are not sure of it but still want to give it a try then that would be at your own risk. We learn from our mistakes though.
- Use a brush without any magnetic properties.
There have been dusters available in the market now with these magnetic features. This might also cause electric discharge towards your system part. So, rather stick with the normal brush.
For heavy dust buildups, especially on fans, I use a vacuum cleaner which sucks air at one end and blows at the other end. I use the other end to blow off dust buildups. This works fine with my machine and I was able to clean hard to reach areas (beneath the CPU fan, power supply, etc.)
Note: This might result to large cloud of dust, especially if your machine have accumulated these dusts for years. So, better do it in an open area where ventilation is good.
Any comments, suggestions, and corrections would be highly appreciated.