I started turning wrenches, gobs of years ago, in KC, Mo. where they use salt on the roads. I fought the rust for years. Then I moved to Oregon, where they use no salt around here. It flashed on me one day how much easier and nice to work on vehicles was because of no rust. Rust is something I do not worry about here. I feel sorry for ANYONE that turns a wrench with the "salt on roads" vehicles.
This is true. Unfortunately, here in Germany we use a lot of salt and that is not good for the vehicles.
But if you regularly clean the underbody with a high-pressure cleaner, there are super nozzles that can be adjusted by 90 degrees, and treat the underbody accordingly, that's no problem.
For this I use Fluid Film and Permafilm, which are products from Germany that are normally used to preserve the ballast tanks of seawater ships.
This is great and keeps the rust at bay.
The famous German ready driver Walter Röhrl once said:
"You can't treat cars like humans, cars need love..."