PriusCar.com
Car Polish
I use Zaino Bros. Show Car Polish. To get the look you see on my home page, I first washed the Prius according to their website's instructions, then applied the Polish Lok (Z-1) Pre-Cleaner and Gloss Conditioner. Over the next few days, I polished it three times with the Show Car Polish (Z-2) for clear-coated paint. That second and especially the third time gave the finish its depth. Their web site has a lot of information about how to get the best results. I also use their Z-16 Perfect Tire Gloss and Protectant--it's the only tire treatment I would ever use (many others will deteriorate rubber).
It is a pain to order: you print out the order form, write a check and mail (yes, snail mail) it to them. Aside from that, they are great to deal with and ship out fairly quickly. The products are more expensive than most but very easy to use and yield incredible results!
By the way, I'm not affiliated with this company and don't know any more about them other than my order experiences.