The reason why paint does not erode away from a vehicle is because new vehicles are protected with a clear coat. The clear coat is a great way to protect a vehicle from the elements, but even the clear coat breaks down and erodes away. Preventing this is the purpose of waxing a vehicle. As this is a laborious process that also depends on a lack of pollen and dust in the air, it is great to use car soap that includes a protective wax as apart of the mix.
If you do not want to do this yourself, let a great car wash apply a thin protective layer to your clear coat to prevent erosion. A local service is offering this method of applying waxing, and the results are commendable. Just look up “paint protection film automatic car wash.” You will find that it works and this service comes recommended.