The first is that regular car washing can remove harmful compounds like salt from the undercarriage of your car. Compounds like this can erode metal components and ultimately lead to structural instability. Regular car washing is able to remove these compounds and prevent oxidative damage.
The other reason that regular car washing is crucial is that it protects the resale value of your vehicle. Cars are frequently exposed to a variety of messes including dirt, bird droppings, and bug splatters. If these are not removed frequently, they can permanently damage the paint of your car ruining its resale value.
This is why it is crucial that you make regular car washing but of your ongoing automobile maintenance.