Because waterproof "24V DC Cooling Fan" no long-term clean-up, external also deposited a lot of dust. I first external waterproof AC fan do a simple cleanup. Let us open the waterproof AC fans, there are two small screws on the fan, tighten them down, close the side outlet on loose. Gently break apart the metal buckle waterproof AC fan, the fan side of the cover can be opened up, pay attention not to break apart the snap angle is too large, so as not to lose elasticity, "24V DC Cooling Fan" in the back when the card is not installed tight. Open fan, waterproof AC fan inside is appalling, various clouds of dust, especially in the exchange of the fan blades on the water is accumulated a thick layer. After a simple brush again with a brush ups and downs, I suggest that you use a paper towel or cloth dampened with water carefully wipe the blades again, it is best not to use some organic solvents, because that would easily lead to fan their parents and, in the high-temperature baking under easier to make blades brittle, accelerated aging, water is more reliable. Patient carefully cleaned, waterproof AC fan look. For "24V DC Cooling Fan" after the central axis of a drop of lubricant before using open approach and then reassembled back on the line. Even to this fan section cleared up.