After warming up a bit when the window actuator was fitted to the Boxster, I Pressure washed underneath the Omega and Boxster at work. This involved laying on the ground for some of the time.
Then gave both a wash.
Had trouble opening the door on the Boxster to drive home from work as the water had frozen around the window and door seal.
Now have various aches from all the time and effort spent in the cold.
It was worth it though as I now have three *clean cars.
* properly clean. Not a load of grit rubbed all over the paintwork like they would be if I took them to some illegal immigrants to be "cleaned".