I used a clay bar on my malibu last summer (which has a color tinted clear coat) and it came out amazingly smooth. The paint job was only 2 years old and the car is always under a car cover or in a garage but I was amazed at how smooth it got. I then used mequirs scratch-X on the bad scratches (only a light polishing compound and haze remover that I really like, it cost about $7 a tube) and then I use Nano Wax ($15). The Nano wax is pure carnuba and has the most amazing finish I have ever seen. But for some reason the only way to get Nano wax off without residue was with microfiber cloths, but damn am I glad I started using those. I recommend Microfiber over terrycloths anytime, I tried them next to eachother and the microfibers take the wax off so much faster and cleaner.