The Camper-Trolley is, in principle, maintenance-free. It is important, however, to store it in temperate, dry conditions and to charge the battery completely at least every two months. You can use wet cloth/sponge and an ordinary cleaning product to clean the Camper-Trolley.
WARNING! Don’t expose the Camper-Trolley to large amounts of water, e.g. using a garden hose, as doing so will damage the motor, battery and electronic components.