I have been using one for 2 years now. The key is not letting the soap or rinse water dry. I have used it on 3 different water sources, you have to keep an eye on the filter, it will load up quickly on very hard water. I learned how to tell when the filter is bad by the way it rinses. My wife and I can wash my truck and her dark blue Tahoe in about an hour. It helps when you have some one to help keep it wet. I also find that the truck seems to repel dirt and rain better and does clean up easier.