Interesting little science-in space, shampoo is a very troublesome thing, then how do astronauts wash their hair?

Hadfield, a former NASA space station astronaut, had been experimenting with "space towels" without knowing how many people had seen it. Today, I want to share with you the astronaut Karen Nyberg she brought: how astronauts wash their hair in space ...

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Indeed, in space, shampoo is a very troublesome thing. Bald head without pressure, headrest wash up relatively simple. However, the International Space Station is a sister, ah, long hair is a symbol of beauty, but after the space has become a problem. Without running water, you can't wash bubbles when you wash your hair. And the general shampoo is more unlikely to come in handy--wash the hair in the way of the ground to flush, presumably the water consumption of a shampoo should reach the space station one day of water consumption. So, in the case of a serious shortage of resources, there is not enough water, how astronauts wash their hair?