Compressed air is sooo much better than soap and water. But, with soap and water, you can't get between the fins. It can be done, but, you can just get a can of compressed air or a cheap 1 to 3 gallon compressor air compressor. (Harbor Freight has them for 44-55 dollars, and yes they are cheaply made, but you can inflate your tires with it too. They are not reliable in a garage, with impact wrenches and the like, but great for dusting.)