The late Joe Domin, famous for his chemical innovations with
Prochem, tested that out extensively with his
Ultrapac Pretreat in an in-line sprayer and
All Fiber Rinse diluted 1 quart per 5 gallons and metered at 3 GPH. He noted a pH drop on the prespray from 10.2 down to 9.6.
That’s not insignificant when looking at the measured distance once you are that high on the pH scale from a chemist’s view, but in most cleaning situations, it would not be.
This was 30 years ago when the fears of cleaning stain resistant nylon had more control over both formulators and users than it does today anyway.
That number would be different with the higher pH presprays being used today.
Anyone can do that test themselves of course.