Clay bar removes surface contaminants. Polish is a commonly misused term, but in general it's the step before waxing that removes imperfections (swirls, scratches, etc.). If you don't need correction, go to wax as a protectant. Some use manmade sealants instead which last longer but many say don't shine as much (especially on red and black cars). Different waxes last different amounts. Exposure to sun makes a difference. I use Pinnacle Souveran wax applied by hand, but polish using a dual action buffer (not the cheap ones that are 12" and sold at walmart... they only go up to about 1500 rpm. DA's go up to 6k RPM). I'm not brave enough to use the rotary buffers, which aren't random orbital.
Read this:
Car Detailing Step-by-Step
The forums there are great. I went on there because I had swirls on my 360. Met some great people, and instead of just paying for a great detail they taught me how to do it myself. I like wrenching on my cars, figured I could start trying minor detailing. Did it the other day on some swirls on the 06 coupe, was very pleased with the results.
You've got a ton of choices... some are all-in-ones, some are 10 step systems. I used to use Zaino, but now I'm trying some other stuff because Zaino took way too long (I've heard they've since been easier to use and dry, but I haven't gone back).
Is your head spinning yet
Here's a great thread showing paint imperfections in a Viper, with some great post-detail shots. Notice how many steps he took:
Rec 05 Viper. Heavily Modified! Esoteric Auto Detail - Autopia.org
So here are a few questions from a rookie....
Are the clay bar and polishes just basically cleaning agents that are applied by hand?
Do todays cars really need these?
Do u then wash the polish off and then apply the wax ,, or do u just go straight to the wax?
How long does a wax last? i currently apply meguairs wax applied by hand but it's pretty much gone after one damp towel wash?