Just today had the opportunity to use my newly acquired DP Auto Bath Shampoo. I am always on the look out for a better than average performing shampoo that is cost efficient when using for personal and customer's vehicles. I don't know that the DP will be one of those considering the cost of delivery, but I do know that my initial opinion is...I like this wash.
TW85, whether it is the difference in water or just personal opinions, my preference in the lubricity category lubricity is the DP product over the 4 Star wash concentrate. Cleaning ability is a wash ( :cool ) between 4 Star, DP and Pinnacle, though the vehicle today didn't present a real test. Pinnacle may have a slight edge (or not :dunno ) over the other two. For today's wash, I used 2 oz of the DP ABS to between 3 and 4 gallons of water. Sudsing was more than adequate, lasting to the end of the wash and rinsed spot free in spite of today's hot Texas sun.