I use Zaino Bros at ZainoBros.com and its amazing. I have a 02 Grand Prix GTP dark blue and visited my dealer for some work and the service writer and the mechanic that worked on my car complemented me on how NEW my car looked. Its a little pricey and there are a few steps involved but it actually looks new again.I use Z-5 showroom car polish with ZFX then there Z-6 gloss enhancer then the same steps two more times the same day and you will never try anything else. Once you use the gloss enhancer the polish goes on like butter. Also, they advise to put the polish on in back & forth motions and do not use circuler motions thus NO SWIRL MARKS. This was hard to believe but they also advise to use 100% made in the USA WHITE COTTON TOWELS and believe me there are NO SWIRL MARKS at all.
Before I forget,
1970 426 HEMI Challenger and 2009 SRT manual Challenger on order with all options in BLACK.