At Petzoldt ́s I bought the cleaning knete in the set. Delivery went super fast I hoped that my paint would be nice smooth. At least several of them advised me to try out the dough. The dough is quite hard. I started to walk over my car with it. I sprayed some dry cleaner (glide from the set) on the paint and found it with the dough. However, the dough slipped away. I then tried the whole thing again without the cleaner. I went over the paint with the dough. Was quite difficult. Luckily only tested it in a small place, because after the action I had many prints on the paint which I got away very hard. Unfortunately, the whole action has nothing. The paint still feels as rough as before Can one give me a hint? Did I do something wrong?