After a simple brush brush again "Micro Cooling Fan" ups and downs, I suggest that you use a paper towel or cloth dampened with water again carefully wipe the blades, it is best not to use some organic solvents, because that would easily lead to "Micro Cooling Fan" fan leaves their parents and, at high temperature baking easier to make blades brittle, accelerated aging, the water is more reliable. After careful patient cleaning, waterproof AC fans a new look. The central axis of the fan after a drop of lubricant, "Micro Cooling Fan" before using open approach and re-assembled back on the line. Even to this fan section cleared up.