You can wash the cover of the sleep sensor when necessary. To do so, perform the following steps:
- Carefully remove the sensor assembly from the cloth cover.
- Wash the cover in a washing machine.
Washing temperature must not exceed 30°C (86°F).
https://support.withings.com/hc/en-us/sections/6216038415249-Aura
https://support.withings.com/hc/en-us/sections/200930228-Maintenance