Car washing is an essential service for automobile dealerships, service stations, commercial car wash centers, petrol pumps, fleet operators, automobile workshops, and vehicle detailing businesses. However, every vehicle washing operation generates wastewater containing mud, dust, sand, suspended solids, oil, grease, detergents, car shampoo, cleaning chemicals, and other contaminants. Discharging this wastewater without suitable treatment can create drainage, pollution, and water-management challenges. At the same time, using fresh water for every washing cycle can significantly increase water consumption. A properly designed ETP Plant for Car Wash can provide a practical solution by treating wastewater and, where the required water quality can be achieved, supporting its reuse for suitable non-potable applications.