I should take a photo of my car. I've left the roof-box on meaning the car hasn't been washed since... ooooh... september.
And my P5 is black.
Just curious, but can't you wash it in wand wash place? That way, the roof box doesn't matter? It's not the best wash in the world, but at least it gets some of the crap off.
You could... but I've pretty much given up hope as well, having washed my car twice since October I believe. The weather's been so bad 'round here this winter that you can't leave the wash-place parking lot without the car being filthy again.
I suppose if I had a BMW, my tune might be different. 
Well, I am a bit (??) anal that way. Even if I know it will get dirty going home from the wand wash, I still wash mine once every 7 to 10 days. I can't stand to see it filthy. Besides, a clean car is faster...less wind resistance....

I don't dry it tho, and the temps here are usually warm enough that it doesn't freeze the doors shut, etc.
Real car nuts like Snowy, tho, they would lick the car dry.....
