Even on a relatively new car the Claybar Job will be a revelation. I used Meguiar's off-the-shelf kit and had no "sticking" problems, following the instructions. It was a rewarding, if time-consuming, project. The act of running your fingers over that super-smooth surface is sensual, bordering on perverted.
Way I understand it, there are a number of "step" systems, ranging from One to Five, all starting with a Wash And Dry. Thus far I've done a four-step: WashAndDry, ClayBar, Polish, Wax. Somewhere in there could be a Sealant. Car looks good, but it spends just 350 or so miles out-of-doors during a normal month, so I've only done it twice in the year I've had it. More often would really be perverse, my view.
I believe just about any of the products already named here - and many others - will produce satisfactory results. Seems to me the "rave" reviews touting one over the others are more opinion than science, and largely due to cognitive dissonance, the tendency to seek and accept evidence supporting a decision or choice while ignoring or discounting contrary evidence.