DIAGNOSIS Silicone rings are notorious for absorbing strong odors from foods like curry, chili, or fish. It's a common complaint. The smell isn't harmful, but it can transfer to milder foods like yogurt or rice.
FIX The most effective method is a good, odorless boil. 1) Remove the ring from the lid. 2) Place it right inside the stainless steel inner pot. 3) Add 2-3 cups of water and 1 cup of white vinegar. 4) Set the pot to "Steam" for 2-3 minutes on high pressure. Let the pressure release naturally when it's done. 5) Wash the ring with regular dish soap afterwards and let it air dry completely. The steam and vinegar will pull most of the trapped odors out.
IF THAT DIDN'T WORK Try a baking soda paste. Make a thick paste with baking soda and a little water, rub it all over the dry ring, and let it sit for an hour before rinsing off. For stubborn smells, some folks leave the ring outside in direct sunlight for an afternoon, which can help break down the odor compounds.
HEADS UP The best practice is to buy a second, different-colored sealing ring. Use one exclusively for savory/strong foods and one for sweet/mild foods (like yogurt, cheesecake, rice). This saves you a lot of cleaning hassle.