I used to own an older IceQ X1950 and it got so clogged with dust that the system would randomly crash. I ended up cleaning the thing with Q tips and it worked about as good as could be solved the random crashes and still works to this day (although I have something far newer now)
My advice is to remove it from your PC and use like 20 Q tips to clean out the fan and all the little fins, also a can of air will help reach the parts you cannot get to with the Q tips.
As a side note I own 2 dogs and I think the dust is a little sticky (or it could be the dust from here in Florida....) so air does not quite get all the dirt and dust
but a little delicate scrubbing with a Q tip will make it all shiny and new