I finally found the recipe.
Yes, I would say it worked pretty well. But we also use Bite Blocker spray (which is awesome). So the combination of spraying this and the personal spray kept us pretty safe.
I didn't add the soap. And I didn't puree everything, I just made sure the garlic and peppers were really smashed. Actually I kinda liked the smell since in my opinion you can't have to much garlic. My garage fridge smelled like an Italian Restaurant.
I tried to spray the yard every week or so and no one ever complained of the yard being stinky.
6 or 8 large cloves of garlic
3 or 4 hot chile peppers, fresh or dried
3 cups water
1 tablespoon liquid castile soap (like Dr. Bronner's or Basic-H)
Put the garlic, chiles, and water into the blender and blend until the garlic and chiles are pureed. Let stand for at least 2 hours or overnight. Pour the mixture through a strainer lined with fine cheesecloth, through a coffee filter, or even a jelly bag. You can also use a wet paper towel, though this takes longer to strain. The idea is to get rid of all of the particles because they will stop up the valve of your sprayer.
Once strained, pour into a jar with a plastic lid (not metal), add the soap, and stir. The concentrate is ready to use, or it can be stored in a cool dark place for a few months to be used as needed. My spray bottle holds a little less than a liter, so I add about 2 to 3 tablespoons of the concentrate to the bottle and fill it with water.