This weekend I am going to use a clay bar on my black '04 coupe for the first time. I want some opinions about which one is the best. But it has to be one that I can buy at a big box store or automotive supply store, because I won't have time to wait for something bought off the internet. What's the best off-the-shelf in your opinion? I have researched on here and on the internet and can't get a feel for what to stay away from or to definitely buy. As always, thanks for your input.

Amd what do you make of that ICE liquid clay bar?