I have tried out quite a few different car shampoos over the years, and while I haven't seen a huge difference between different brands, I have stuck with Meguiar's for a while now. You can get a 64 oz. container, which will last quite a while, for only $8. When mixed with water to the proper dilution ratio, it provides a good amount of suds and foam, and its lubricity is great. This is very important, because it helps lift all the raod grime, dirt, and bugs off the surface of your paint, all the while keeping scratching o the paint to a minimum. One bucket easily lasts one very dirty car, so you don't have to refill your soap halfway through washing, as I have had to do with some other brands. Over all, I have really liked using this car wash, and would recommend it to anyone looking for something to use on their car.