Did some googling and got this:
How do I remove the food smell from the sealing ring?
The Instant Pot sealing ring is made from silicone rubber, which is more durable than natural rubber based products. Silicone may pick up food scents during cooking. While many people are not troubled by this characteristic of silicone and do not find that flavors transfer, some people are more sensitive to it.
To remove the smell, you can “steam clean” your Instant Pot by adding 2 cups of water or white vinegar and some cut-up lemon rind, and running the “Steam” program for 2 minutes with the sealing ring in place, then allow the sealing ring to air dry. Alternatively, you may remove the sealing ring, and put it into your dishwasher. High temperature and strong detergent will usually remove most smells; however certain highly acidic foods may leave a residue. Some people have had success first soaking the silicone ring overnight in either white vinegar, or lemon juice, or bleach, or tomato juice, and then running it through the dishwasher. Others have found that storing the ring in a plastic bag with ground coffee or baking soda is effective, and finally some have found that using “Hunting Odor Eliminator” from a sporting goods store is effective.
Many people like to have one sealing ring for highly scented/spicy foods and one for mild/sweet foods with fewer odors. It is recommended to always have a second sealing ring on-hand for other reasons as well, like a spare tire, as no pressure cooking can be done should the sealing ring fail. You can purchase additional sealing rings at https://instantpot.com/store/home.php.