How do I get rid of gnats that are in my plumbing?

https://www.youtube.com/watch?v=oSaC-WJAHBA hope this helps you out

Hydrogen Peroxide solution kills fungus gnat larvae on contact and Neem Oil can keep adult gnats at bay.

Sounds like you need to clean your drains. I use 1/2 C baking soda & 1 C vinegar. Pour the baking soda into the drain. Follow with the vinegar. This will boil up immediately so either close the drain stopper right away or, if it is a disposal or shower drain, slap a soft flat plastic drain lid on it and hold it down with your hand until the foaming stops. Let sit for about 1/2 hour, then run water to flush the drain.

how can I ever thank you for answering ,This is the first common sense answer I have received ,I am getting to it right now ,Thank You

We use this same method to keep drains clear and clean. Every so often I use bleach and microwave hot water to flush it later. And lemon juice refresh’s the drains also especially disposals.

Abig Thank You

I had a terrible gnat problem and the vinegar traps worked perfectly! Simply place a few tablespoons of apple cider vinegar or white vinegar, a few drops of dish soap, and a tablespoon of sugar in a bowl and stir. Set your bowl in an area where gnats are prevalent, such as near your sink. This took care of my problem in just a couple of days!