Using this Hydro Flask Tandem Cooler Cup is a breeze. If you want to keep two standard 12 - oz. cans cold, just place them inside the cup and use the Cooler Cup Collar to lock in the cold. You can also use it as a 26 - oz. beverage cup for your hot or cold drinks. When using it, make sure to place it in a stable position, especially when it's full. As for maintenance, since it's dishwasher safe, you can simply pop it in the dishwasher for a thorough clean. But avoid using abrasive cleaners as they might damage the Color Last™ powder coat. Keep it away from sharp objects to prevent scratches on the stainless - steel body.