I just washed my car after a nice rain shower 2 days ago that I washed the night before and i honestly have to say a black car is the worst car to try and fix and make perfect. I think i brought my swirls back somewhat. I see the sunlight beam down on my paint and what do you know there are swirls. Maybe i just did not completely get them out when i buffed it a few weeks ago. The car looks great when the sun comes down. This is getting so pathetic you clean a black car and its never perfect when its dried. A black car shows you what you have missed when cleaning. Everything i do to try and keep it spotless and there is always something wrong. Im letting my frustration out to you guys. 
