ok i'm a painter for a body shop and i can tell you how to do it

what you need is a da or random orbit sander and some 3000 grit trizac pads and all you have to do is spray water on the bottom of the pad and wet the car with a spray bottle as you go down the car and once the car is dull wash it with clean water and then buff the car i know it sounds easy but its alot of work but if you need some one to do it i can help you with it