For wheels that bad you might need something more like Meg Wheel Brightener. But if the wheels are pitted there is not much you can do about that. Happen to have any pictures?
I have both Non Acid (2:1) and WB (4:1). I use WB on extremely dirty wheels and Non Acid on tires and light-med wheels. They are both extremely cheap per oz.
I used it full strength. Its on sale for $14.99 plus I had the labor day discount code, couldn't pass up that deal. I had been waiting for it since it was announced.