Bought the 12$ the works, not only a lot of soap is left on the car after the wash. Don't expect to have your rear end of your car washed. Expect 50% of the dirt to stay on the car. The spot free rinse is not really spot free. So you'll see spots of water unless you towel it. somebody wrote its better than the laser wash and that's why I went but that person surely is delusional. Laser wash has 100% better quality than this wash for the same price.