Out Damned Spot

Scientists at the University of Michigan Ann Arbor did a study that found when people washed their hands with soap and water after a decision, they felt justified about their choices and felt increasingly better about their decisions.
The decision was between appealing options. The thought is that if a person has (at least) two appealing things but must select only one, they have a tinge of regret for what they had to give up.
I haven't tried it on myself, but I am intrigued with the idea.
Hmmm. I wonder if your customer is able to be encouraged to wash their hands AFTER they leave the finance office, or AFTER they receive their service bill, they would wash away those tinges and feel even more satisfied? I wonder if you could subconsciously improve a Very Satisfied customer into a Completely Satisfied customer.
Well, why not? At least show off those sparkling, newly remodeled restrooms of yours. No harm in trying!