I could give it 5 stars (I reserve judgment), but I would be exaggerating in my evaluation.
1) Obviously, the product cleans the interior of the car. With a brush, any "stains" on the ceiling disappear. For example, I had touched a dried twig, resulting in a black line. I had tried with a little AVA, but it didn't remove it, whereas this product did.
2) The product is incredibly economical, as it is quite concentrated. You only need to use a small amount in the sprayer and you're good to go. It will last a long time!
3) It smells really nice, at least for my taste, it reminds me of scents from an old barbershop!

Of course, one cannot expect miracles. For example, it cannot remove dirt from a very dirty seat, as that requires a vacuum cleaner. But for all other surfaces, with a brush (as I mentioned) and a cloth, it does an excellent job!

In conclusion, it removes light, surface stains. For difficult stains that are deep-seated, we need other tools, but that doesn't mean the product is at fault anywhere!