Doug, there is a truck wash in Brookshire Texas, about 20 miles west of Houston, if you are headed west. It is on the south side of I-10 behind a Citgo station and a BeeLine oil change place. They have DI water. You will see a Flying J station at the exit as well. I have only used it on one occasion, just be sure they use fresh brushes when they wash your coach because they do a lot of trucks there. If you need any more info call me. Home 979-627-7050, or cell 713-256-7161.