Du weißt auch wie du E-Autos Löscht?
Fill the AB-Mulde with water by connecting a hose to an unit which has pump, and drop the E-cars into the AB-Mulde by using the crane on the WLF.
Though I didn't know how to remove the wreck vehicle from AB-Mulde yet, but you can try to press Shift, and click the "DEBUG" icon in the command panel to reset the AB-Mulde back to the station.