Why cars rust

So you don't believe that spraying the underside with oil or a non corrosive solvent before the salt is put down will help keep corrosion to a standstill or there aren't others with any other secrets so to speak in regards to rust?

If everyone were to believe that, we'd all be driving rusted cars, but luckily there are some as I've said in the original post that actually are car persons and have many solutions that the average car owner fails to realize in regards to almost any problem and these solutions aren't of value to those who'll always find a way to make a joke of it while asking questions down the road like why is the sky blue :)