this is laughable statement.I think that since around early 1980s, the auto manufacturers have whipped the rust issue. We had a 1983 Benz 240D until the fall of 2009. It never had any rust issues, and we lived in NJ for the first 7 years of its life. Then storage 4 years and 6 years in very humid Baton Rouge. Last 9 years here in Virginia.
I wouldn't do anything but keep it washed when you can.
Most domestic and Japanese cars around here in VT start to rust at 5-7 years and are gone by 10-15. I see pickups that rust in the fender wells after 2 or 3 years.