A bit sceptical at first, but rather desperate so gave this a go. Took quite a few applications over a few days, but it was quite a large area and had been left overly long. Our lovely kitty (not) had taken to using our walk-in wardrobe carpeted space as her toilet, while we were on holidays. We didn't realise the smell was so bad as both of us had lost smell after bouts of Covid! While the carpet colour has not been restored, the smell has most definitely gone. I did find you had to douse liberally, and work the spray into the fibres for it to really 'get down to business'. Very glad I bought the ready-to-use and the concentrate, so always a supply on hand!