Truth Be Told...
Earl, et al...
Truth be told, the plastic pex washing material of years gone by never really scratched the finishes of cars, as was frequently claimed.
Instead, as a result of those operators who failed to provide the adequate lubricating detergents to make the friction material clean and track smoothly, the plastic material actually rubbed off onto the surface of the car. The rub transferred onto the paint... above the surface, and was easily removed by polish... or frequently by a cleaning detergent.
But, because the problem of some operators seeking to minimize their chemical costs by using too little chemical... or an inferior cheaper substitute, the results were that people actually felt the marks of plastic residue were paint scratches.
As you noted, when the plastic bristle tip actually flagged into micro-bristles, it was both ultra-soft and a great cleaning tool.
Although the Belangers actually brought cloth to our industry, I still vividly recall Sonny Fazio's sensational ads claiming that plastic bristles actually scratched cars. Seemingly in a few months, he as well as some less flamboyant others had customers convinced that going to a carwash that still used plastic bristles... was a high-risk event.
Consequently, the awesome power of consumer pull-through
marketing changed the face of carwashing. Yes, the Belangers introduced cloth, but had not a few influential carwashers jumped on-board, its future might not have been so bright. Also, to Sonny's credit, it unmistakably motivated the sale of a heck of a lot of cloth replacement material throughout the industry. He, along with the Kirrikian brothers and a few others, were the prime movers of the cloth washing material revolution.
We enjoy a very robust industry... along with many very colorful people.
Entrepreneurism personified. You really gotta love this country!!!