Hi, we're sorry to hear that you are having stains that have caused you to not have a great experience with our Elkay VBTHD3 Quartz Classic Drop-In Composite 33 in. Double Bowl Kitchen Sink in Greystone with Color Match Drain. Thank you for letting us know about your experience. It is our priority to ensure customer satisfaction. We do have artice available on our online Help Center for care and cleaning along with removing stains from Quartz sinks, which I have included the link to below. It is recommended to clean Elkay sinks daily to avoid build-up of soap or mineral deposits. For daily cleaning use an ordinary mild detergent and soft cloth to rinse and dry the sink. Using a 50/50 white vinegar and water solution with the Mr. Clean® Magic Eraser® or a small amount of baking soda and water on a toothbrush can help remove tougher stains. Please contact our Customer Care department by phone at 800-476-4106 or email at productsolutions@elkay.com as we would like to discuss the matter in more detail.
https://helpcenter.elkay.com/s/article/Quartz-Sinks-Clean-Care
https://helpcenter.elkay.com/s/article/Removing-Stains-From-Quartz-Sinks