Have you ever heard of Highway Hostesses? I'm reading Fanny Flagg's book- The All Girls Filling Station's Last Reunion. The highway hostess is mentioned in the story.
Highway Hostesses were RN's hired to check out bathrooms.
Matilda Passmore was a registered nurse who was the "leader" of the Highway Hostesses. She believed, according to company literature, "in the need for daily use of an approved germicide such as Lysol to overcome the inherent fear of women for possible disease which may be contracted in contact with toilet facilities."
Highway Hostesses would visit Phillip's stations at least once a month. At each stop they would inspect bathrooms as well as provide suggestions about how a station could be more appealing to motorists, especially the "feminine motoring trade."
Here's the link to read more about the Highway Hostesses