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This picture is of an S5 coupe rear end in Estoril blue when it was collected from a dealer on the M4 corridor after they washed and polished it. The guy who owns the car (Shrek on A5OC) ended up paying £750 for a correction detail to remedy the issue. I've seen the car in the flesh and the job the detailer did was astonishing. The dealer ended up paying a good % of the cost as the guy was going to have a new car detail anyway.
I think there are two breeds of folk when it comes to car cleaning. Those who see a clean car and because it's got no dirt on it it's clean. Then there are those who obsess about the purity of the finish on the painted surface (swirls / depth of shine / beading etc.). Those in the latter have a far more stressful and expensive car ownership experience. Owning black cars unfortunately I'm in the latter group :-(