For several years I had a AA spray vendor which I nbelieve was made by Magic Mist, the same company that makes the air freshener machines. (I still have it but it is no longer in service)
It used the same air compressor / venturi principle as the air freshener machines with an elec pushbutton on the gun connected to the solenoid in the machine.
It worked OK, the timer was a pain as was the cabinet locking system. The trigger switch was also a pain. Biggest drawback was that there seemed to be a lot of product on the ground, which made a mess causing it to be slippery and creating a sticky wet dirt over time that customers stepped in a dragged into their car. It was due to the drawbacks that I stopped using it. Maybe I can post a photo.