M A G M A
Next, use a can of compressed air from your local computer store to blow out any dust that may have accumulated in the chassis fans.
Be sure to keep the can of compressed air about six inches from the parts being sprayed with air. Pay particular attention to the fans in the
chassis 
and power supply 
because they are critical to air movement and to keeping your chassis cool. Also spray the PCIe slots
on the backplane, and the chassis bay areas 
. If you have mounted hard drive cages in one or both of these areas, be sure to check for dust that can collect in the space between the drives.
Next, you can use anti static wipes to wipe down any open areas inside and outside of the chassis to remove any remaining dust or dirt. If you have dust or dirt remaining in any “hard to reach area”, such as corners of a fan blade, you can use the cotton swabs, dipped in the isopropyl (alcohol), to gently rub the area clean.
Lastly, if the chassis was extremely dirty, you can remove any installed 3rd Party cards and wipe the PCIe slots with a soft bristle brush (like a toothbrush), dipped in the isopropyl (alcohol), to gently clean each slot. When finished, blow the slots with compressed air from about six inches away until dry.
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