what is the best way to keep ur system clean from the inside and how often do u do that. plz give ur opinion. yesterday when i opened my system's cabinet . there was a lot of dust setting near the ram slot. so i took my vacuum cleaner and used the blower to clean it. success. it easily got away. i also cleaned the smps fan with the blower, lot of dust came out. One more thing the front side or the upper side (ie the side on which chips etc are present)of any card can be easily cleaned with the blower but on the other side the dust just doesnt seem to move. how can it be cleaned. is there any need to clean it?