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What are flies doing by rubbing their hands?

Flies always rubbing their hands is a physiological phenomenon that exists in flies themselves. A common saying is that this is a way for flies to clean themselves. "Rubbing hands" is to remove dirt from each "hand" Dirty stuff, keeping it flying, crawling and taste sharp.

Flies move around and have a lot of dirty substances on their bodies. If these substances are not removed, they will increase the weight of the fly and affect its flight. After being stained, the suction cups on its hands and feet will absorb it when it lands. On the surface of objects, it is not easy to walk quickly even if you stop.

When a fly lands on some smooth surface, such as a piece of glass, the tips of the hairs on its feet will secrete a liquid with a certain adhesive force. This liquid can help the fly to land on these surfaces. It is possible to stand firmly on a smooth surface, but these liquids will also be stained with things, which will make the fly unsteady when landing and will also cause problems when taking off. So in order to keep it clean, flies rub their hands back and forth.