Hello everyone! Disclaimer: please note that the following information is provided as general guidance for washing tumblers. Handwashing: it's usually recommended to wash your tumbler by hand using warm, soapy water. Dishwasher safe, place the tumbler on the top rack to prevent potential warping or damage from heat and detergents. However, handwashing is often the preferred method to maintain the tumbler's appearance and insulation properties. Avoid extreme temperatures: tumblers are designed to keep beverages hot or cold, but extreme temperatures can affect their performance and durability. Avoid exposing your tumbler to excessive heat or extreme cold. While we strive to provide accurate and helpful information, we cannot be held responsible for any damage or loss that may occur during the cleaning or care of rhinestone tumblers. If you have any concerns or questions regarding the cleaning and maintenance of your specific rhinestone tumbler, please contact the seller.