Use any soft brush along with bike/ Automotive cleaner or diluted liquid soap with warm water and a cloth to clean the frame of your bike, but care must be taken not to use pressurized water or immerse any of the electrical components; they are rainproof but cannot be immersed in water. The motor can be cleaned with a damp cloth, but should not be immersed in water. The battery can be cleaned with a dry cloth. DO NOT use soap to clean disc brakes as this can leave residue on the surface and cause the brakes to squeal.
To clean the electrical contacts remove the battery first then discharge residual voltage by pressing the power button for 10 secs. Use an Electrical/ Electronics contact cleaner spray and then let it dry before reconnecting.