You can clean your Body using a cloth dampened with water. If water is not enough, you can also use white or cleaning vinegar.
Important: Do not, under any circumstance, use any solvent or any other cleaning product to clean your Body.
https://support.withings.com/hc/en-us/sections/6212630854033-Body
https://support.withings.com/hc/en-us/sections/115001378708-Maintenance