sweet… wash mine 
I had to laugh when I got out of work at 5pm, and there were people washing their cars at the car wash next door. And then it started raining not 5 minutes afterwards.
I washed mine today… at least I got all the mud and salt off it. Plus got to see the winter damage to my paint so far. yay.
I didn’t wash mine, and it looks JUST like it was washed.
I usually don’t bother during the winter unless it is gonna be nice/dry for a few days in a row.