Does anyone know how the name brand purple stuff is versus the autozone cheapie? Like "Super Clean" vs. "Purple Power"? I just went through a gallon of the purple power and I thought it worked pretty good, I wouldn't say it was spray on and pressure wash though, I did a LOT of scrubbing. And it seemed like it did not work when I tried diluting it with water, I had to spray it full strength. Just wondering because it's time to buy more, wondering if the name brand stuff is worth it.