Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: avoid this at all costs

This product has ruined the appearance of our new hardwood floors. It leaves behind a hazy film that makes the floors look terrible. The problem is that when you see the haze, you think it needs cleaning so that you use more of this product to try to clean it. We have spent hours trying to get this gunk off our floors and it is backbreaking labor. DON'T BUY IT!