If my recollection is correct, they actually use a combination of fiberglass and steel wool for brushes and constantly 'shed' that stuff (along with debris) at high velocities. Painted surfaces within thirteen feet are routinely destroyed. Also, the street 'cleaner' uses a mild-PH sulfuric acid, which (incidentally) is the exact same paint stripper they use at the MBZ factory. It also melts OEM tires.

I'd wash your car RIGHT NOW! Or at least go and have a look at it to see if there was any damage...

hehehe