Using your Stanley Classic Food Jar is super easy. Just open the lid, which also serves as a cup, and fill the jar with your hot or cold food or drink. Make sure to close the lid tightly to keep it leak - proof and to maintain the temperature. When it comes to cleaning, you can either wash it by hand or simply pop it in the dishwasher thanks to its dishwasher - safe feature. As for maintenance, avoid using abrasive cleaners that could scratch the stainless - steel surface. Also, if you notice any unpleasant odors, try filling the jar with a mixture of water and a bit of vinegar, let it sit for a while, then rinse thoroughly. Keep your food jar in a dry place when not in use to ensure its long - lasting performance.