Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great K&N product

I enjoy K&N Air filters...I've used this product on a K&N replacement filter. Its very easy to use, but make sure you use gloves because it is harmful. My filter was really dirty but with the easy application of the cleaner and then the oil spray brought it my filter back to new. I recommend this product to any K&N owner. I'm very happy and I will re-purchase once I'm out.