I am looking to stock up before the spring. I have used, and was very happy with, DP Extreme. Great foam, thick, long lasting. But as with all things in life...good = $$. DG CWC is $30 /gal and DP is $50/gal. Anyone who has used both have an opinion on how much soap you had to use for each one? Obviously if CWC needs twice the concentration it defeats the cost savings. I am assuming quality of the product is the same for both.