Long-term food residue gives birth to many germs, and the germs cause bad smells in the lid and the sealing ring. To prevent it, you must wash them regularly and sterilize them. If it doesn’t work, remove the sealing and soak it in white vinegar overnight. Then wash it in the dishwasher. If possible, use a separate sealing ring for the sweet and savory foods. Change the rings in every 10-12 months.