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The astronauts wipe their body clean by using a wet towel, and wash their hair by using waterless shampoo.
Since water does not flow in a zero-gravity environment, the astronauts cannot wash their hands under a faucet as you do on Earth. So, there are no sinks or showers inside the space shuttle.
When the astronauts want to clean their hands or faces, they either wipe themselves clean with alcohol or by using a wet towel containing liquid soap. When the astronauts wash their hair, they use waterless shampoo, which does not need any water for rinsing. Waterless shampoo is used since it has no foam, which could spatter inside the Space Shuttle. After washing, they use dry towels to dry themselves off and their washing is done. To clean the body, they simply wipe their body by using a wet towel soaked with body shampoo.
Brushing teeth (left)
Washing hair (astronaut Mamoru Mouri(center), astronaut Chiaki Mukai(right))
