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In today's world, there are thousands of building around us, but they all have a problem, cleanliness. Although those buildings may have magnificent structure and design, there are still water stain and dust on the surface. People designed many kinds of window cleaner, for example, those huge and expensive machines that were put on the top of the building for people to use their life to clean the window, or those small robots that can suck on the window. But they are suitable to clean buildings that are surrounding us. To able to solve this problem, I designed a drone that not only can clean windows without people's hand but also cleans it mo
Hao An Yang,