Oh, I thought they were using some new product/process from Blitz? Re-watched it and they do mention that it "works with any clay or clay bar alternative".
SON1C - Can you explain the exact process you used? Did you wash and rinse the surface 1st?
Go to min.1:26 it shows their steps also search for nanoskin at Amazon and they have almost if not all of them pretty cheap the mandolin washcloth w clay side was for 32 $ last time checked