Maintaining a Air Cooler

I was just wondering how would I go about to get the dust out of my Hyper 212 Evo. Compressed air is not really cutting and would it just be better to just rinse it out with water or something...

Take the fan off the cooler and use a small brush (toothbrush) to get the dust out/off.

with or without water?

No water. take the fan off and use a brush and compressed air to remove the the dust.

huh well thanks