Food storage container with rubber seal
Credit: Flickr photo: Moosicorn/( http://www.flickr.com/photos/moosicorn/5598566095/)
If dishwasher safe, place both the container and the lid in the dishwasher and wash after each use. If hand washing, wash both the container and lid in hot soapy water, paying special attention to the area around the seal as well as any grooves where the cover attaches to the container. Rinse thoroughly and allow to air dry.