I have been using z9 and z10 on my leather seats and I really like the cleaner, but the z10 just isn't cutting it on the seats. They look ok for a couple days, but after that they look worn and dried out. I have tried applying it by hand, with a towel and always the same results. I am assuming the leather is coated right, most newer car seats are from what I have read on here? With that in mind I was thinking about ordering some griots leather care so see if that works any better. The car is a 2001 pontiac trans am if that helps to determine if they are coated or uncoated. Thanks for the help.