Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work

I have a one year old Achilles inflatable that I needed to clean up before putting away for the winter. I bought this product thinking it to be the best for this type of boat. Wrong! Not only did it not remove heavy stains, it didn't even remove light stains or dirt, even if you used brute force!So I went into my garage and pulled out a bottle of "boat soap" from West Marine and with no elbow work or effort at all the dirt and stains were easily removed. Even though the boat soap is designed for rubber boats I thought I'd give Maguiar's a try based on their advertising. Big mistake. Will never use again. It is no better than using vinegar and water.