I'm thinking it's just dried mud. Look at the lower half of the grill and the treads of the left front tire - the car was likely totally covered in mud and the rain washed it off the rest.
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"If I could get back all the money I've ever spent on cars...I'd spend it ALL on cars !!!
Man that sucks !! But if I lived in that part of the US, the last thing I would own is anything nice or valuable. You know it's just a matter of time before Mother Nature will take it away. Too bad about the car, but there's lots of people hurt or getting hurt as we speak.