Luigi Bormioli Michelangelo 20 ounce Beverage Glass, Set of 4.Care & Use: Before Your First Use: Remove all labels from your glassware. Wash the glasses in warm water using a gentle, non-abrasive dishwashing detergent or place directly in your dishwasher. Rinse and dry immediately with a lint-free towel or cloth,To hand wash, use a gentle, non-abrasive dishwashing detergent and warm water. Rinse thoroughly to assure no detergent residue is left as this can interfere with the aroma and taste of wines, beers and other beverages. Dry immediately with a lint-free towel or cloth,Please note that Luigi Bormioli glassware is dishwasher safe. If you choose to clean your stemware in a dishwasher, arrange securely in the top rack with the bowl facing down. DO NOT place in the bottom rack or lay glasses on their sides. Once the cleaning cycle is complete, immediately remove glasses from the dishwasher and hand dry with a lint-free towel or cloth.