To clean and maintain Schaerer Coffee Art C, follow these steps: 1. Regularly clean the brewing unit and milk system using the recommended cleaning solutions. 2. Descale the machine every few months to remove mineral deposits. 3. Clean the exterior with a damp cloth. 4. Empty and clean the coffee grounds container and drip tray. 5. Follow the manufacturer's instructions for specific cleaning and maintenance tasks. Regular maintenance will ensure optimal performance and longevity of the machine.