Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works great, even usefull for litterboxes

We've been using F.O.N. over five years now. It's always worked well, and doesn't leave a kind of overpowering sem-masking scent like typical air 'fresheners' and scented disenfectants do. With F.O.N., the odor really seem s to be elimiated. Seems to work well for urine smell from litterboxes too.