I'll chime in with those who brag on their interior cleaner. It is very effective. I use it for spots on home carpets as well as the car. Of all their products, I use Speed Shine, the clay, and their microfiber cloths the most. I wasn't familiar with Autopia and some of the other sites until I joined this forum. It sounds like there are excellent products on those sites as well. I don't know how interchangeable some of the products are between Griots and others. If anyone has experience there I would appreciate it. I have used the Griots products exclusively since 2001, am happy with them, but always open to getting something else if it is better.