Natural Gnat Killer What you will need: 1 small jar or bowl 1/3 cup apple cider vinegar 2 tbs water 1 drop of mild liquid dish washing detergent such as Dawn. Instuctions: Pour apple cider vinegar into the jar/bowl. Add water then add just one drop of mild liquid dish detergent. Set the mixture in the area where gnats are a problem. The gnats are naturally attracted to the vinegar and the drop of soap kills them.
Gnats, especially, cannot stand up to vinegar. If you notice bugs infesting your houseplants, spray a one part vinegar and five parts water mixture on the leaves. Dilute this mixture even more and use it the next time you water the plants.