when to replace a clay bar?

[Nimbus1]

I've only used Meguires hard clay bar. The kit comes with 2 bars and I used the first one to clay 3 cars that had never been clayed, including my RL 3X = 5 cars total. After that, it was getting pretty ugly. I just did the RL yesterday with the second bar, which makes 2X with it. I can still fold it and get enough clean looking clay to keep using it.

[Tcape]

Originally Posted by L1dws

I've used meguires, Adams, and Griots, and the Griots has worked the best. If you have a random orbital for scratches you can use the Griots system of polish 1-4 and top with Sealant or their best of show wax.
Good luck

I'll sure 2nd the use of Griot's clay bar. That's the only one I've used, and I can't imagine any other company's being any better....or as good.