Do not go into this car wash with a car without scratches, do not go into this car wash if you have recently waxed your car. The cleaning devices pick up impurities over the course of the day, week, month. 1 speck of sand will make the design impractical for newer cars. The wash will also remove wax and help you discover deeper problems. Of course they will tell you you need a polish, it was already there, it is oxidation, etc.