I have a 2001 trans am, it is black. I have been using zaino on it and have been very pleased with the results, except for on the rear bumper. The rear bumper on the f-body's collect a lot of dirt and dust and I think this is where they come from. I think the swirl marks must be too much for the zaino to cover. I have some 3m smr, 3m perfect it II, and some meguiars #9 swirl remover, which would be the best to start with. I will be applying it by hand if that makes a difference, what would be the best way to do it by hand? Also, I have a small scratch near the bottom of the car it is hard to see if you are not looking for it, but you can feel it, what should I use on this or is it to deep to do anyhting with? Here is what I was going to do on the back bumper:re-clay, use swirl remover, dawn wash the bumper, and then re-zaino? Any other suggestions?