coyotefreek's right! I really wouldn't think that you need a clay bar yet, unless you have ignored your paint for a while or drive through a lot of crap on the roads.
I would think that a thorough cleaning is all it needs, I recommend performing this twice a year. After a lengthy wash with Dawn dish washing detergent, (this will remove all of the old wax), get a good cleanser such as Zymol's or P21S's, a good glaze, (I like 3M's Imperial hand glaze or Meguiar's New Car glaze), and get a good wax. This is really a 4-step process if you count the wash. This should bring your paint back to the way it was.
If you're really into getting the best results for your paint, get a Porter/Cable polisher also. You can read my detail guide
here. It will give you all the info you need.
Also, coyotefreek has but together another detail guide that you can find
here.