I agree that the best chemical dilutions will be found by trial and error
I have learned, used great products, not cheap soaps etc.... you use more cheap
soap to achieve decent result so no cost saving
When I bought my SS car wash 2 years ago, they used cheeeeep products, no scent, no color no foam.....
I am very pleased with Trans-Mate soaps, waxes etc from
Kleen Rite (disclaimer-I have no financial relationship with
Kleen Rite or Trans-Mate except..... I give them $$$ for their products !! LOL)
Start with a tip in the middle of the chart (buy a bag of them, assorted sizes), look at what products look like coming out of their nozzles, change tip to more or less to achieve a visible, foamy and smell experience for the customer.
My advice, the products they use in the bay are the most important part of our SS car washes