Instruct: Classify an Amazon review into positive or negative sentiment.
Query: It does nothing to my berber carpet...

It does nothing that I can see except leave a pleasant scent. I scrub it in with a firm bristle brush, wait 30 minutes, vacuum with my Dyson, and my carpet still looks the same. It is only 2 years old so it isn't an old carpet. It might work on carpets that are more of a "pile" but not berber. I gave 2 stars just for scent alone.