Here are some important steps to limit the damage, and the sooner you dive in the better off your car and your finances will be. Wait too long and corrosion and mold start to develop. The first step is to determine the extent of damage indicated by the floodwater level. Depending on the water level, a full restoration may be required. At the very least, all exposed components will need a thorough external cleaning and to be given time to fully dry. You will likely have to rebuild or replace certain components.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2012/11/14/what-to-do-after-the-storm