Although the first car wash appeared in 1914, it would take a few decades to figure out the best way to go about it.   Since dirt roads were the norm back then, the car undercarriages would get extremely dirty.  
One solution was a flooded circular basin, such as Chicago’s “Auto Wash Bowl” depicted here, in 1924.  The cars were driven around, and then detailed by hand up top.  (via Findery)


Bootleg liquor, seized in a Prohibition raid and labeled with their poisonous contents by Los Angeles Police Chemists - 1928

Prohibition lasted in the United States from 1920 - 1933