My son bought me for Xmas the Nouvelle Copper & Stainless Steel 10 pc cookware set. Just open the box about a month ago and have only used the skillets once. The skillet has only been hand wash, but after washing it leaves stains at the bottom of the pan. Stains are like a white dirty color. I don’t want to use anything abrasive on it, but I’m not sure how to get the discoloration out. The pans look terrible. I included a copy of a pan that I haven’t yet used due to this issue.