Before first use, it's recommended to wash all parts of your Contigo West Loop mug. For daily cleaning, the lid is conveniently top-rack dishwasher safe. To ensure a thorough clean, open the underside of the lid completely by pressing the release button before placing it in the dishwasher. The mug body, made of double-wall stainless steel, must be hand washed. Use warm, soapy water and a bottle brush to clean the interior. Rinse thoroughly. This mug is designed to be compatible with most standard car cup holders and can hold a wide range of hot or cold beverages. Avoid using abrasive cleaners or scrubbers on the stainless steel body to maintain its finish. Always ensure the lid is fully assembled and securely tightened before filling with beverages to prevent leaks.