Its cool that they give you something to follow up the clay bar with. The NXT is a good synthetic to use because of the shine it produces and its ease of use, its just that it doesn't last as long. If you car is garage kept you should only have to clay about twice a year, but if it sits outside alot, I'd be lookin' to clay twice that many times. As soon as you fee a fair amount of "grit", pull that bar out and get busy.