To use this mug, simply pour your hot or cold drink into it and watch the design change right before your eyes. It's a really cool effect! When it comes to cleaning, you should only wash it by hand. Don't put it in the dishwasher as it might damage the heat - sensitive design. To keep it in good condition, handle it gently. After each use, wash it with mild soap and warm water, then dry it with a soft cloth. This way, you can enjoy the changing design of the mug for a long time.