Baking soda and vinegarnStart by pouring ¼ cup of baking soda down the drain, and then leave it for about 10 minutes. Then, follow it with one cup of vinegar. Let the mixture fizzle and work for a few minutes, and then finish by turning on the water and running the disposal to clear out any leftover food waste.,
The lingering sewer smell should be permanently neutralized by the next day or about 8-12 hours. It's important to note that the smell isn't immediately gone.