These can be thrown in the wash just like anything else. To avoid shrinking, wash on cold and tumble or line dry.
Please use common sense when using these diapers. These need to be changed often, they are not something you can put on for hours without changing it. This is no different than a diaper for a baby and you would never leave your baby in a dirty diaper. Rabbits go to the bathroom a lot. If you have time to change these, they work great!
Note: Please remember to wash your bun after each use in the diaper, or once a day if they're in it permanently. Close contact with urine for extended periods of time can lead to urinary tract infections or irritation of the genitals. Gently wash with soap and warm water in the area that has gotten wet.