I really like the Ultima Waterless Concentrate. It can be used as a detailer, Waterless wash and a rinseless wash depending on the ratio of water it's mixed with. I just did a rinseless wash this morning. I used a half ounce of concentrate mixed with 2 gallons of water. The car is very slick after using it. I pushed the envelope a little since the car is outside 24/7. It's been 2.5 weeks since it was washed last. Ideally I think 7 days btwn washes is ideal when the car isn't garaged.