Pre-cleaners dissolve dirt in a targeted and gentle manner, matching to the type of contamination.
The regular washing should be done exclusively by hand, as car washes are the main cause of scratches. Even modern textile car washes are no alternative, despite the advertised softness of their cloths, because they scratch the paintwork as much as the familiar brush rollers. If you then choose the "hot wax" programme, all the fresh scratches will be nicely covered - until the next rain shower.
Of course, if you love your car, you can push it. But it's smarter to wash it by hand and gently remove the dirt. The paintwork says thank you and shines deeper for longer.