Last week I used a manual wash when it was 4F out. One side of the stall had the garage door pulled down, so the water would take a couple of minutes to freeze. I even used the brush (after I thawed it out). The salt caked to the vehicle was that bad and I couldn't stand it any more.
Everything froze on the car, but after a few hours in the garage it thawed, and I finished drying it.
Everything froze on the car, but after a few hours in the garage it thawed, and I finished drying it.