I just looked at what QEW is and its good for the winter, since most people's hoses are turned off. How does this actually work? You just spray it like a SD and scrub? What about drying, is it like a polish. Does it really wash the car or will it just scratch it from the dirt? What about spray detailing just keep doing that instead? Also on there QEW site, does anyone know a coupon code for discount when ordering?