37 Maintenance and repair of automobiles, wagons, trucks, vans, forklifts, towing tractors and other utility vehicles; maintenance and repair of structural parts for automobiles, wagons, trucks, vans, forklifts, towing tractors and other utility vehicles; maintenance and repair of machines for automobiles, wagons, trucks, vans, forklifts, towing tractors and other utility vehicles; vehicle cleaning; vehicle polishing; vehicle lubrication