To eliminate gnats in your sink, clean the drains thoroughly and use vinegar or baking soda to kill larvae. Reducing moisture by fixing leaks will prevent gnats from breeding in the sink area.

Gnats often breed in the organic matter that accumulates in sink drains. Pouring vinegar or baking soda down the drain will kill larvae and clean out the gnat breeding grounds. Reducing moisture by fixing leaks and keeping the sink dry will help prevent further infestations. For severe problems, using drain-cleaning products or professional pest control services may be needed.