Move away from the snow!!!!!
Just kidding
I personally havn't had to deal with it, but I think you are overlooking something. Even if you hose the exterior of your car off, what about the under carriage and the inside of the wheel wells? You will have to pay extra attention to these areas because I would think they see the most amount of salt. Sorry I couldn't be much help, but I just thought I'd point that out. Take care, Keith