And it would be good to keep them dust free with brushes and pressurized air.
+1
Yesterday I cleaned one of my Jupiters and temps fell 10 degrees.
Inside it looked like a dust bomb has exploded. I used a painting brush with long and soft bristles to wipe everything, even between the fins of the cooler and the fan blades while sucking everything with the vacuum cleaner at the same time. It took me around 30 minutes for a good deep clean.
I have to clean all the others soon, but I hate to turn them off.