For 15 years I was buying our chemicals from my local supplier. No scent. OK cleaning power. Contained surfactants and silicone. No modern polymers. Customers were satisfied with the cleaning ability, no complaints. I looked into injecting with a scent, but didn't have the room in my pump room for 2-3 more containers. I was also concerned about chemical compatibility and didn't want to dilute them. But, when I switched to Blendco 5 years ago (with scent)... WOWZA! Customers became very vocal. They instantly knew I had switched chemicals & could tell & SMELL! They were more impressed with the smell than the show. The car wash up the street uses a cheap foaming
soap. Thick PINK foam that smells like Bubble Gum. Leaves a surfactant film, but customers are convinced its working great!
If you decide to try scent, I bet your customers would notice.