how to get rid of gnats?

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Household Fixes Method 1 Dealing with Gnats in Sinks and Drains. Scrub inside the drain pipe to remove organic matter. Grime that builds... Method 2 Making Gnat Traps. Trap gnats in a jar filled with vinegar. Find a used can or jar and fill it about halfway... Method 3 Preventing Gnat Infestations. ...