Lid: The best way to clean the Ellie lid is with a disinfectant wipe. Otherwise, a microfiber cloth works great too. Microfiber cloths are oftentimes included when you purchase new eyeglasses.
Tray: To clean the inside tray of Ellie, get a clean cloth damp with water then ring out excess water. Avoid immersing in water. Particularly avoid getting water onto or inside the lid. Proceed to wipe the empty compartments and remove any particles that you may see. Let the device dry completely before adding pills back into compartments.