I have been a Griot's Garage customer for several years and have always been happy with their product quality, prices and, more important, the value of their products. However, I never tried their clay cleaning kit because it sounded counter intuitive - rubbing clay on my Porsche's paint - forget that! As they said in Ghostbusters, "It would be bad!"But one day, I was in my Ferrari friend's "ta die for" garage and he said he was about to "clay" the paint on his $300,000 Italian beauty - getting it ready for a car show. I think I said, "Are you SURE you want to do that?" about 10 times. But he just laughed and said, "pull your Audi in here and let me show you why you want to clay your paint." Skeptical but trusting, I wheeled the A3 into the shade of his workshop and watched in awe as he washed off a big section of my car's hood. Then, after drying, he sprayed Griot's Speed Shine on my paint, grabbed a wad of this silly putty looking stuff, soaked it generously with Speed Shine and began to carefully massage my paint. He gently rubbed, re-sprayed and worked the clay until, testing the finish from time to time with his left hand, stopped, wiped off the paint and said - "Touch your paint and you tell me what you think..." I was AMAZED! The finish was as smooth, scratch that, SMOOTHER than new. The clay, as if by magic, had removed whatever was stuck to the paint and it did it without scratching and without removing paint! It was the best finish I had ever felt on any car I have ever owner and I have won more than a few car shows with my Porsches.If you have a car that you really care about and want to have the absolute best finish possible, give the Griot's Clay Kit a try. The Speed Shine product (something I have used for years) comes in their high quality, reusable sprayer and by itself, it does a great job touching up your wax job. In this kit, it's the lubricant that helps the clay glide off the impurities stuck to your paint. A match made in heaven. Claying is a labor of love but there is labor involved so if you are into instant coffee and microwave TV dinners, this may not be for you. But if you are a little nutty about your car, this kit is for you.  Without being too redundant, the end result is simply amazing. I especially like using it on glass because the wipers seem to work better and I think I see better too.Good product, good company - highly recommended.