the old fashioned car wash... because a lot of horse much was getting stuck to the bottom of cars in the 1920's

above is an Autowash Bowl in Chicago 1924 http://justacarguy.blogspot.com/2009/07/lost-to-yesteryear-only-known-to-us-by.html

above is from http://thiscircularparade.com/2012/02/14/a-novel-concept-for-a-car-wash-focused-on-cleaning-the-undercarriage/