Reza,
Thank you for taking the time to share your experience. We’re sorry to hear that this sink didn’t meet your expectations. We are sorry to hear that you are experiencing these stains on your new sink. Typically, when spotting appears on a Stainless-Steel Sink like ours it is simply surface discoloration. This is usually taken care of permanently with a stainless-steel polish and/or cleaner when used according to the directions of the cleaning product. Products such as Bar Keeper’s friend and a fine 3M Scotch Brite pad are both great options. Please contact our customer service at 1-800-775-0703 or customerservice@kraususa.com if you’d like to continue the conversation.