The innovative Nick & Nora cocktail glass from Riedel's Drink Specific Glassware collection is machine made to enjoy the drink effortlessly and elegantly by delivering it perfectly to the middle of the palate. Riedel glasses have a shelf life of approximately 1,500 washes in a dishwasher, the equivalent of 20 years. To avoid scratches, make sure that the glasses are not in contact with other glasses or metal objects in the dishwasher or in the cabinet. If possible, use a glass rack. To avoid stains, use soft water with a low mineral content. To remove stains, use a little vinegar. When washing by hand, use hot water with detergent and rinse the glass gently. Avoid storing glasses in cabinets near strong smelling foods. This could alter and tint the glass or even affect the aroma of wines.