This 20Oz double - layer slim plastic tumbler is easy to use. Just unscrew the lid, fill it with your favorite beverage, and use the complementary straw to enjoy. When it comes to cleaning, you can wash it with mild dish soap and warm water. Avoid using abrasive cleaners as they may scratch the plastic. Also, don't put it in the microwave or dishwasher to prevent damage. Store it in a cool, dry place when not in use.