When I spent the week on the salt in '98, I rented a van here in Wichita and told them where I was going (they didn't suspect trouble). There were no carpets, but I used plastic and tape on the floor. A simple rinse took care of that. On the way home, I ran through a lot of rain - but I ran the van through a couple car washes with undercarriage sprayers once I got home.
No problems.