They use foam brushes. No bristles of any kind. Best wash and price around.
We can't speak for other car washes but at Four Seasons Car Wash we only use soft closed foam. Nothing sticks to it and not only will it not scratch but it actually helps polish!
I've never had that problem here or other drive thru washes. I've only seen that issue at the cheap car washes that move around the car while it sits still.
Thanks! Your answer is awaiting moderation.