A quick scan through your own reviews, especially anywhere clients write more than a star rating, often surfaces a pattern shops rarely think to look for on purpose: mentions of how the car smelled afterward, sitting right alongside comments about the paint or the price. That detail is worth paying attention to deliberately, not just scrolling past as a nice aside.
If scent already comes up unprompted in your reviews, that is a strong signal it is memorable enough to be worth building into your actual marketing, not just something that happens to happen. Pull those specific phrases, with permission, into your own materials: your website, your social presence, your booking page, since customer language about scent tends to read as more credible than anything you would write about it yourself.
If scent never comes up in your reviews at all, that is useful information too. It might mean your current approach, whatever it is, is not distinct enough to be worth a client's attention, or that you are not currently offering a finishing fragrance at all and there is real room to add one.
Either way, treating your own reviews as a research tool, not just a reputation score, surfaces details about what clients actually value that a lot of shops never think to systematically check. The finishing scent is a small enough detail that it rarely gets asked about directly. It is exactly the kind of thing that shows up unprompted in a review, if it is genuinely landing.