Stealth your just be glad you didnt look like a lunatic cleaning your car in the rain!
I've done it once before, but the car used to be parked out of sight rather than on a main road as it is now. Hence trying to wash it now is a bit counterproductive, given the roadsplashes at the moment. Also, the last time I did this, I caught a cold. Not good!
Maybe I should buy some road cones and block the road off.