Here is an excerpt from one of the industry books I use to sell. Hope this helps a little.
On the road wash bays are most always located near truck stops on major highways. According to National Association of Truck Stop Operators, less than 30 percent of all truck stops have wash bays.
Convenience is the major factor when trucks are washed. If the truck is "working," it is not convenient. Trucks are more often washed before or after their run or in conjunction with maintenance.
Hand washing is by far-and-away the most acceptable commercial wash standard for trucks. This means the result is "clean & shiny" and dries without spots or streaks.
Trailers are not usually washed by hand. Since there are many types of trailers the standards vary. Most companies have lower standards for trailers than trucks. Brokers have higher standards than company drivers.
How much a company or owner pays to wash their trucks is driven by how much they value image. In general, this is the one issue on which most companies and owner operators agree; the best wash for the least amount of money.
Ultimately, the size, type of vehicle and convenience factor will dictate the wash method used and the cost involved. The costs listed below are for a tractor and trailer combination.
Mobile wash services charge between $15 and $25 per truck and $10 to $20 per trailer. Commercial hand washes charge between $25 and $50 per truck and $25 to $50 for a trailer.
Companies with an automated
fleet wash in the yard can spend between $5 and $15 per vehicle (utilities and chemicals).
Typical cost to build a commercial truck wash is between $250,000 and $400,000 plus the cost of real estate. The typical facility will wash between 40 and 50 rigs a day. The average price for tractors is $30 and $50 for a tractor trailer rig. Operating expenses are typically between 70 and 80 percent of gross sales.