[lcmlee]

Depending on how much dirt is on your car, a clay bar can probably be used once or twice. I use it on both my cars with no problem. I use only as much I think I need, typically enought to hold on to, as you don't need much. Again this depends on how much the clay will pick up from the surface of your car.

After claying the cars, I use the clay bar on the rims then throw the clay away. For the price of the clay bar I don't see any sense in keeping it much more than this.