Some good ways to fix a smelly kitchen drain include pouring 1/2 cup of baking soda down the drain followed by hot water, or putting vinegar in the drain and then rinsing it with hot water. If these approaches fail, use a stronger chemical drain cleaner such as Bio-Clean.
Using baking soda and hot water to fix a smelly kitchen drain is ideal because it does not corrode the surface. Put 1/2 cup of baking soda in the drain, wait 10 minutes, and then run hot water down the drain.
Another method is to use vinegar. Vinegar is stronger than baking soda with regards to cleaning. Pour vinegar in the drain, wait for 10 to 15 minutes, and then rinse it with hot water.