Their best bet right now is to try and flush out the car with de-ionized or soft water in order to get rid of any of the salt left from the storm water. It has already been two weeks but flushing/washing with soft water will help.
Yep, just a normal winter back in the old days when the city used to drop salt by the tons starting mid Nov to mid April, well yeah it didn't get inside but the car I feel is not "ruin" just needs a very good cleaning-the sooner the better. Salt washes away. I would remove the seats and carpet and wash it inside and out, flush the engine bay and trunk out as well. Towel dry it and take it from there.