The family has a "Micro Cooling Fan", it came to my home has been for several years. A hot summer, spinning it around the clock, faithful service for everyone in my family. Day after day, "Micro Cooling Fan" on getting covered with dust. One day, my parents are out, I am a person at home doing their homework. Finish the job, I was sitting under the fan playing with blocks, After a child, I thought I heard the fans, said:. "Little Master, would you please take my bath, my body is dirty and itchy, a little uncomfortable." I looked at the "Micro Cooling Fan", found its color has become dark, is not that give it a bath.