Customers want a clean vehicle...period. I understand all of the real world examples of ripping out a friction and putting in a touch free and tripling revenue, or vice versa, and I can't help but think that it had actually nothing to do with the change from friction to touch free or vice versa. It was the complete gut and redo of the wash itself and the fact that it was something completely new. People equate remodel and something new and different from what was there before as better and an upgrade, regardless of whether it was friction to touch free, or touch free to friction.
I have a friction and a touchless side by side, and I've actually had customers comment that they thought they were the same wash, they've used both and can't tell the difference. I will say this though, if you have one of them go down, you want the friction one down, not the touchless, as the people who do have a preference, always have the specific preference towards the touchless because of the usual negative stigma with friction washes. A person who has no preference will just happily use the friction instead as they don't care, they just want a clean car. This is my two cents.