Structura08 in 1/2” - Posting because that ear is perfect! :)
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)