The product was used in a three-year-old car with not many kilometers. Any stains that were present disappeared and the interior now smells very nice. As for how much it "revives" the leather, I couldn't draw conclusions because, as I said, the car is neither old nor worn out. I tried it on the steering wheel, which - logically - is more worn out, and some small dull areas disappeared..... However, I wanted to see it in more demanding situations: so I used it on leather shoes and my wife's leather bags. The results were very good here too. And yes: there were worn leather surfaces here and the product worked as promised.