Neo glide
Jefe:
Cannot say for certain that neoglide causes fine scratches, but I can say that it will not clean certain "dirty" cars even with sufficient shampoo and water.
The only way I know of lessening the micro-scratching of the dirt on the finish of the car whethe you use plastic bristles; cloth; neoglide, a wash mitt or a wash brush is to insure you flood the surface with a lot of water and a lot of shampoo.
It is not so much the material doing the scratching as it is the dirty on the finish.
When I first saw "foam" 15+ years ago at Auto Mechanika in Frankfort visiting both the Italian brush company, Favagrosa who I believe developed the concept and also on the Italian equipment company, Ceccatto's equipment we asked one of the owners of Ceccatto if they had problems with the foam being too light to wash "dirty" cars. The man smiled and said, "you must be a car wash operator?"
He said, "yes that on certain dirty vehicles the foam was, in fact, too light to do as good a job of cleaning as plastic bristles or cloth."
As an operator of a 100' exterior wash a few years later I made the mistake of putting some "neoglide" in my wash, unfortunately on the wrap-around brushes and that was a big problem.
In Portland we have both a very difficult oil film first and then dirt film on the surface of the car from the constantly wet asphalt pavement and it is difficult to remove.
No matter what I did we could not get the neoglide to properly remove the oil film. When we switch to cloth the problem was solved.