I`ts nothing that you have to do every month, but once or twice a year its good to get all that accumulated dust and breadcrumbs off your fans and other parts.
I`m sure there is a right and wrong way of doing this but this is what I have found that works for me.
A good quality ladies make up brush (soft and fluffy
) a small vacuum cleaner which is held a few inches away from the PC. Gently brush the dust off the fans. You can usually even remove graphic and memory cards to brush clean,before working on other parts inside the tower. Just be careful not to hit anything with the vacuum,and always disconnect all the power sources.
It will slightly reduce noise,and fans will have less grunge to spin around.
Thats my story.!!! Whats yours?? Or have you never thought of this.
cheers