Whoever believes with Sonax Spray and Clay as a kind Clearasil for the car to find wrong pretty. With wipe away and nothing is done here. However, the basic principle is pretty nifty: you spray a lubricating liquid on the car and forme a paddy with the dough. The is quite affectionate at hand and you should moisten his hands somewhat when you take the dough out of the cute box. The best plan something Gleitspray. Then proceed according to the instructions. Always nice Gleitspray rub on the paint and the clay. Always make sure that a lubricating film between clay and paint remains. Without pressure will not do, and to clean a larger vehicle so full is quite a lot of work and tiring. Then wipe dry with a microfiber cloth or clean cotton cloth. After this thorough cleaning of the paint should be smooth, so you can apply a polish or wax. The bottle lasts for one and a half cars, admittedly somewhat larger. As my Gleitspray has gone, I have replaced it with a mixture Sonax Turbo cleanser and water. Works almost as well. It is then probably also on the mixture. Dishwasher or the like is not recommended. Conclusion: Most contaminants will go away, but not all. The dough is quite expensive if you let it fall and must be replaced.