Agreed Lots and Lots of warm soapy water. Wet the car and do section by section (starting at the top) and rinsing well before moving to next section. Each car has a few section where dirt swirls around and collects, a wet mitt and a little elbow grease get the dirt that a car wash or pressure wash can't. I have read that a kitchen detergent works well but I use a designated automobile wash solution.
In the winter I do cheat and go to a touch less car wash, sand and salt do get into the undercarriage and a car wash does help. I usually hand clean my windows and mirrors afterward. The lines of the B seem to flow smoothly and washing it takes less time than other cars I have owned.

I was hoping Derek might visit the coast and pay for his stay by applying a little Mother's Paste Wax....

Lots of people out here with a spare room and dirty cars.
Bill
Was Sunny in Surrey but predicting SNOW this weekend!!!!!

