Why can't astronauts shower in space

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ASTRONAUTS' DAILY LIFE
Astronauts' lives are very different on a space station. They cannot have showers because
there is no gravity and everything floats in space. The astronauts have to use soap and wet
towels. They have to use a special toilet, too. Meal times are very different to the ones at home.
The astronauts have to eat dried food in bags. They have to sleep in sleeping bags when they are
tired. Astronauts tie their sleeping bags to the walls so they don't float around. Life in space is
not the same as life on Earth.
1. Why can't astronauts shower in space?