The materials in the silverware's alloy contribute to the presence of rust spots on silverware that has been in the dishwasher. Leaving wet silverware to air dry inside or outside of the dishwasher can also lead to rust spots.
The best way to keep silverware from rusting is to hand-wash it and dry it immediately. Wet utensils should never be left in the sink or to air-dry in the dishwasher. Higher-quality silverware is less likely to rust, stain or pit. The best flatware on the market is 18/10 construction, which is made with 18 percent chromium and 10 percent nickel. A higher nickel content means that the silverware is more durable and resistant to corrosion.