Funny it's Jan 20, and I hand washed the car. It must have been almost 50 F. Which is a stark contrast to 15 F overnight Tue. I just had to since the car got salted on Fri.
I must say, as much as people get down on the BMW paint, orange peel, etc., my car is 6 y.o., dingless, and it still looks like a mirror when its clean. imho BMW's paint lasts!