Autochem products have undergone extensive testing by the people who count, our customers. Our experienced field representatives work with our customers to ensure complete satisfaction. If you are not completely satisfied with any of our products, or any of our replacement suggestions, simply return the unused portion of your product and you will receive your money back. Need a sample? Our success is based on results, and we are more than happy to provide a free sample and demonstration to prove the quality and performance of any of our products. This is our guarantee to you. Sincerely, Bob Duplessis President CRS AutoChem