In a few years, ALL car washes will move in this direction ... but you can be the first, in 2021
Believe it or not, your current detergents in the brush system are almost neutral and LOW cleaning!
Your detergents lead to poor washing results, and now I'll explain why.
There is a basic problem: usually in the sequence of products that go into the tunnels and plants, very mild and neutral detergents are used to make the wax work at its best, so as not to counteract drying.
Basically the shampoos you normally use are deliberately weak, because they are chemically designed to be compatible with the wax.