When I worked at a dealership there were two different sections of washing. One section was for new cars which all went over to the detail department. They were in charge of taking off the transportation white protecting materials, washing the car, vacuuming, etc getting it ready to be on the lot or picked up by the new owner. The products used in that department were superior to those used for service car washes.
When a vehicle was serviced on it was brought down to a wash bay where a couple guys with what were basically brooms, a hose, and a vacuum washed cars with water and soap that got changed MAYBE once per day so whatever dirt and grime was picked up throughout the day made it onto every other car that went through that section.
I always advise against dealership car washes if you care about your car. Most people don't seem to and are just happy that from a distance it looks cleaner than when they arrived.
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