So, in terms of the amount of liquid, it really is enough to do two cars. The clay definitely lasts for more. I consider this a bit of a downside since it is sold as a set. The clay is really pliable, it didn't tire me at all. Compared to another company's, it was much softer. Since when I tried to use it on the car as a beginner, I can say that by following the instructions I didn't create any scratches or anything. Now, regarding the liquid, even a simple exterior detailer does a fine job to use in combination with the clay.

Very good foam, easy application and deep cleaning of dirt on color and plastics. It does not reduce washing time, it simply penetrates much better in "difficult" areas, such as grilles, door handles, etc.