VIETRI flatware is made of the highest quality 18/10 stainless steel. Stainless steel is not stain proof. Ingredients found in tea, coffee, salad dressing, vinegar, and salt can cause discoloration. Pitting or spotting is usually caused by hard water or salty foods. Our flatware is dishwasher safe unless otherwise noted. We recommend using the low energy/dry cycle with the handles placed up in the basket. Use a lemon-free, mild, and non-abrasive detergent that does not contain chlorine, alcohol, or perfume. Overly hot dishwashers may tarnish the necks of flatware. Dry flatware with a soft towel immediately after washing to prevent mineral or stain buildup and streaking. Do not leave acrylic handled flatware in the sun for a long period of time.