Instruct: Classify Amazon reviews into positive or negative sentiment
Query: IT REALLY WORKS!

This stuff really works. Great for immediate elimination as well as long term elimination. Most insect sprays won't kill the larvae that are left behind after adult fleas are killed. This stuff kills the larvae (eggs) as well. Lasts for best part of a year. Easy to use. Take your pets out of the house for the day when you spray.