Here is what I do, I know own a black car as well so the system has not changed, same results.
-Wash car w/ dish soap (very little)
-rinse car and use the clay bar system (comes with a spray to keep car lubricated and clay bar) Run clay bar across the car from front to back motions covering all painted surfaces, spray often to rinse.
-Dry car completely with towels or chamois; door jambs, fuel door, under hood, trunk.hatch.
-Look over the car with a bottle of Meguiar's Scratch X to get noticeable scratches and blend in deep ones. Try rubbing in all directions or circular motion around the scratch to get every part of it. Do not worry about swirl marks at this point.
-Use Step 1 Meguiar's Paint Cleaner, DO NOT LET DRY, rub into a small area, then wipe immediately. For example, the door I two in two sections, top part and bottom half. Hood is in 4 sections, etc. Use two rags so you can wipe it vigorously and then clean off. On a black car if you did the previous steps right you should not notice any filming (i.e. that darker swipe that looks like there is still stuff on the car). Look at the part from a bunch of angles to make sure. This brings the full color back to the car and all metallic fleck and gets rid of deeper swirl marks.
-Use Step 2 Meguiar's Paint Polish. This removes finer swirl marks and gives the paint that wet look, your can let it dry but not completely, slightly less than you would if you were waxing. Once this step is done the car should start to feel very smooth.
-Meguiar's Gold Class Mirror Glaze Wax. I use the liquid as in all my products. I use ciruclar motions, big circles that is and spread it thick all over the car in big portions. Let this product dry completely and rub with one towel then buff with a second. This gives the final mirror coat and protects the car and seals in all the other steps you have done.
I won't get into engine, interior and other detailing that I do as well. But i do this process in full twice a year Spring and Fall and inbetween throw a coat of wax on if necessary. I always use a wet/dry spray wax after each wash to bring the wax job back. I also only use the microfiber towels, they give the best results.
Here are the bottles I use for paint detail:
Meguiar's Scratch X
Meguiar's Step 1 Paint Cleaner
Meguiar's Step 2 Paint Polish
Meguiar's Gold Class Wax