I would recommend that you clean dust from your case using compressed air or a specialized computer cleaning blower, both can be used to dust the inside of your computer.  Also, many cases contain a dust filter than can be easily removed and cleaned with a damp rag.  To perform this maintenance:
1. Shutdown and unplug your computer and relocate it to a location, like outside, where you wouldn't mind dust floating around.
2. Remove the case cover and dust filters.  
3. Blow the air through the fans, heatsinks, PSU or anywhere dust has collected. Be mindful to not let the fans spin to harshly, as this can generate current that may damage internal components.  If your computer case has dust filters, use a damp cloth to remove the dust.
4. Replace the case cover and reinstall the dust filters.
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