Sparkle Car Wash at 1421 Main Street, Barstow, California.

This facility is may be easy to overlook. It doesn't pop out at you other than a line of cars are waiting to be serviced. The employees are friendly and helpful. The process and options are really simple. You DO have to exit your vehicle just prior to it being cleaned.
Although it may not look like much, the service was very thorough. Everything was cleaned and dried well. The options are very well priced compared to other businesses in the area close by. But, if you are in a hurry, you may want to think twice. It is a slow process and 5 cars in front seems like it'll be 25 min, at least.