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Similarly one may ask, what are flies doing when they rub their hands?

Rubbing Behavior Flies rub their limbs together to clean them. This may seem counterintuitive given these insects' seemingly insatiable lust for filth and grime, but grooming is actually one of their primary activities.

Secondly, what do flies do when they land on you? Flies don't vomit when they land on you. "Flies don't have teeth, instead they have a spongey mouth part that soaks up food," explains Tommy. Since houseflies don't have teeth, they'll vomit on the food to make it wet and then they'll dissolve it and eat it.

Keeping this in consideration, why do house flies rub their hands?

Flies keep relatively clean, rubbing their legs and then using their legs to rub their big eyes and wings and maybe their bodies if they can reach. Those bristles covering a fly are all sensory, and keeping their sensors and their eyes free of dust and dirt helps them see the world better, literally and figuratively.

Why do flies rub their hind legs?

Flies rubbing their legs are cleaning themselves. They can also often be seen rubbing their back legs often. Additionally, flies also often clean their wings, compound eyes and bodily bristles. These taste receptors alert the fly for sweet (food) and bitter (poisons) substances.