Using your Ferm Living Oli Wine Glass is a breeze. Just pour your favorite wine into it and enjoy. When it comes to cleaning, you can simply put it in the dishwasher as it's dishwasher - safe. However, be gentle when handling it because although it's made well, glass can break. To keep it looking its best, try to avoid using abrasive cleaners. If you notice any stubborn stains, soak the glass in warm, soapy water for a while before rinsing. Also, since each glass is unique in color and has tiny bubbles, don't be alarmed by the natural variations. This is part of what makes your Oli Wine Glass special.