Instructables
This is a very simple concoction that i came up with one day. It Was originally supposed to be ant killer, but it just made them even more upset. So i tried it on the insect that bothered me even more than ants: mosquitoes. AND IT WORKED! so i tried it on gnats; IT WORKED! So i thought that i should share it with everyone else. 
 
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Step 1: What You Will Need-

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1. Listerine Mouthwash
2. Dish soap
3. Vinegar
4. Water
5. Spray bottle (Windex)
6. (1 cup) measuring cup

Step 2: MOUTHWASH

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Put half a cup of mouthwash into the spray bottle. This one is for the mosquitoes.

Step 3: VINEGAR

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Add about 1/4 cup of vinegar into the spray bottle. This is very acidic and irritates the insects. if you add a lot of this, you can sprinkle baking soda onto ant hills and spray the finished product on it. this will fizz up and the ants will become trapped.

Step 4: DISH SOAP

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Add about 1/4 cup of dish soap to the mixture. This makes the wings of gnats and mosquitoes stick together. If they don't die by the time they hit the ground, you can crush them. Don't add too much, because it can clog up the straw in the spray bottle.

Step 5: WATER

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Add as much water as you would like. The more you add, the longer it will last. If you don't add much, it will be a lot more potent, and could possibly kill ants. i would recommend using more water.

Step 6: GO KILL SOME MOSQUITOES!!!

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Here is one that i killed in a matter of seconds.

Step 7: CAUTION

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This is very sticky. To avoid contact with hands, wrap in paper towels.