I really like the Griots carwash soap, high quality product with lots of suds. I also like the new Turtle Wax ICE carwash soap, smells great and produces lots of suds and isn't that expensive, especially when you pick it up from Costco. The Griots soap is $30 a gallon, but well worth it IMO. I've even combined the two and did so using an old Tide jug that has the spigot for dispensing the product, you even lay it on its side to boot. If you really care about your car, doing the job right and consider how long a gallon will last you, you'll agree that $30 for a gallon of quality carwash soap is a small price to pay.