http://www.cnet.com/pictures/life-on-the-international-space-station/

飲食、閒餘時間、定期身體檢查、剪頭髮、處理舊衣物...

No need for detergent

Clothes, such as the socks worn by this ISS crew member, get dirty just like they do on Earth. But there's no laundry system on the ISS; instead, crew members eject the dirty clothes, which are incinerated in Earth's atmosphere.