If the outside of Nima gets dirty, you can wipe it down with a soft, damp cloth.
If food or liquid happens to get inside the sensor, this area can also be wiped clean with a soft cloth.
The inner area where capsules are inserted can also be wiped clean with a soft cloth.
Just be sure not to submerge Nima in liquid or get liquid inside of the capsule area, or use any cleaners on the inside of the device as Nima might be damaged and malfunction.
Do not use bleach or other harsh chemicals to clean Nima.