Wow, that stuff is crap.
I have been a fan of Zaino since i bought my PT in 2000. I have had great results with their clay. In addition, i don't use spray detailer when i clay. I use a capful of their car wash solution mixed into a spray bottle with water. Works great and is a heck of a lot cheaper than using up a bottle of $8 detailer.
Plus the Zaino clay costs less than the Griots.