With a compressed air can you get a nozzle which can be used to point the air blast at exact selected areas of the computer - for instance between a fans blades you could blow at the heat sinks fins.
Here is my dust problem, I have to clean every 2 days.
Dust Particles are mainly outside the system due to good filtering everywhere.
I was thinking of a mini vacuum cleaner.. I prefer suction over blowing.
Would these cans be of help?