How to Get Rid of Smells From the Bathroom Sink Overflow
1. Combine 1/2 cup of baking soda and 1/4 cup of table sale to make a natural scouring mixture.
2. Pour 1 cup of warm distilled white vinegar down the sink.
3. Flush the drain with hot water for 30 seconds.
4. Check whether the overflow pipe still smells.
5. Repeat if needed.