How astronauts take a shower in a spacecraft ?
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. More
In this video an Italian female astronaut has revealed, the mechanism to wash your hair.
keeping in mind since there is no gravity at space, the forces of cohesion and adhesion which distinguish water from other liquids make water stick on Astronaut's body.