> The problem, however, was that his technique only really cleaned the underside of the cars. This was useful back in the days when many roads were still unpaved and their undersides constantly got filthy.

I know a guy who dropped out of high school and started his own logistics company for moving specialized equipment. He then also built a business of semi-trailer truck washes in rural areas where they would pick up LOTS of dirt and mud on unpaved roads.

As someone who lives in a state that uses road salt I wouldn't mind such an undercarriage wash option I could quick driver over, but those are typically bundled into a typical car wash.

Url changed from https://www.weirduniverse.net/blog/comments/carl_bohlands_au..., which points to this.

Edit: changed from https://www.vintag.es/2019/12/the-auto-wash-bowl.html to original source; see below.