Optimum No Rinse is your friend. But, if it is that cold, I don't know if you have any real options unless you can get inside. I use No Rinse in my garage in the winter and it works well.
2015 M4 | Austin Yellow | Black Full Merino Leather | DCT
2014 Corvette Stingray | Z51 | Torch Red | 7MT - Sold
2012 MB C63 Coupe | Performance package | Obsidian Black - Sold
2011 E92 M3 | Jerez Black | Fox Red | DCT | Competition Package - Sold