I bought carpet drying fans, it blows at floor level, a wide swath of air. I put it in front of the vehicle to keep air circulating and dry underneath. I put it on a timer that goes on every 2 hours for 30 minutes. It’s at the front of all three bays in a heated garage, unless you have a moisture barrier under the concrete moisture can rise up and cause rust or pitting like it did to my Harley under a cover years ago. I never gave it thought as it was under a cover which ended up trapping the moisture and cause expensive damage. Live and learn.Minnesota here, king of salt and brine spray on the streets. Frequent wash/rinse at the common car wash works fine. We simply take the SUV’s to the car wash as frequently as possible avoiding bad roads during the next day or two. Otherwise we just let them collect the bad stuff. For example the next few days don’t call for precipitation up here. Late tonight I’ll go get my DD washed and park in my heated garage. They look like new, all the white scum disappears like magic.
The Challenger? Never seen a day on the road when brine or salt of any form is present.