Back in 1977 when I was 18, right out of high school, and showing truck mounts, we had a "secret formula":
We would add a gallon of
Prochem Wide Range Industrial Cleaner to our truck mount's stock solution, which brought the pH up around 12. It worked great on restaruants and apartments, which is what we usually got asked to demonstrate on.
Prespray? What's prespray?
A Prochem salesman from a nearby state used to make a mix of oil and dirt that only would release with this stuff in his mix. At trade shows he'd put it on "his" carpet and dare anyone to outclean him.
Then one day he got brave and poured it on the
Hydramaster guy's carpet in front of a bunch of cleaners. The
Hydramaster guy punched him out right there in front of everyone. That was the end of the "special sauce demos"
Those were the days.......
Now I'm a middle aged,
IICRC shareholder/instructor, and I have a salesperson do the demos and I make him prevacuum and use all of the "right stuff".
I'd no sooner tell him what I did then than I'd tell my stepson the stuff I got away with in school that I'd ground him for if I caught him doing today.