I used the clay bar in conjunction with a couple other products. It was a three-step process. It did a pretty good job.

I've clay barred my cars. Clay barring does a nice job of removing surface contamination....bugs, tar, over spray, sap etc. The test to see if you need to clay bar you car is to put a zip lock bag on your hand and rub it over the surface of the car. If it feel rough, you need to clay bar. It's fairly easy to do, but you can create swirls and scratch the paint if you get too aggressive or don't use enough lubricant. I use Chemical Guys light clay kit. It comes in medium, and heavy. The more problems you have, the more aggressive clay bar you should use.

 

When using the clay bar, use plenty of lubricant, and just mold the bar into a flat circle. Use a side to side motion (not circular), and every now and then ball the clay up and re flatten it into a circle. And whatever you do, if you drop it, throw it away. It will pick up grit from the ground and scratch the bejesus out of paint. I then follow it up with a quality wax and hi-shine sealant. I usually clay bar in the spring (it's on my list of things to do soon). You can also clay bar your windows....doing that and following up with Rain-X works great. You don't even need to use your wipers in a light rain.

 

Here is where I get all my detailing stuff

 

Car Wash, Wax, Polishes, Microfiber Towels and Best Auto Detail Supplies - Chemical Guys Professional Car Care Products - Wholesale and Retail