1. Use the "gentle" cycle in the washing machine or hand wash if required.
2. Do not overload the washing machine with other heavy items (i.e. blue jean).
3. Use cold water.
4. For gourment that can get out of shape easily: avoid hanging (掛) gourmet; lay it flat on a heavy towel in a freezy room. It takes longer to dry but it won't get out of shape.