Reason for rusting includes humidity trapped in places where
rust then occurs. In he garage, those spaces would dry - rust
process halted. Even better is to rinse salt out of those
spaces with water - not the salt recycled water found in car
washed. What does a car wash do? Wash that salt into places
you don't want it. But more important is to get those 'deep
inside' places dry.

TP wrote:
> Here in the western New York we use salt on are snow covered
> roads.
> True or False. Driving daily and garaging your car. Does a car
> rust quicker if garaged with the salt slush and moisture on it
> (dripping on the floor)? Or is it better to keep the car outside
> the garage in the natural frozen winter elements?
> Of course the driver does routine maintenance on the vehicle.
> Maybe even a few commercial (undercarriage rinse) car washes
> from time to time…
>
> Has there been any studies done?
> Will it matter if the garage floor is epoxy coated or natural
> concrete?
> Insulated and unheated garage and other combos...
>
> TP