Its tidal fresh water Exzim, this place is about 90 miles from the sea.
Well past the salt water limit.
The problem with getting the car submeged like this, is the wiring, the water gets into every connection and starts corroding it slowly.
For ever after the car will suffer niggling little complaints with every affected part.
Exzim, this is one hell of an advert for Audi's.
It came round that corner with the wash going across the bonnet and up and over the screen.
I dont think many cars could do that.
Even the big 4x4's were turning back at this point.