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Does anyone have experience either with garlic sprays on plants/soil or getting rid of fungus gnats?

I suspect that these little flies came in the soil of two herbs I bought this spring, and they have now infested my whole patio garden.

These are the recipes I have found:

1: Baking Soda Spray

1 Tbsp baking soda
3 Tbsp vegetable oil
1 gallon of water
1/2 tsp dish soap

Shake. Spray every 5 -7 days.

2. Garlic Spray

1 head of garlic
3 cups of water
2 Tbsp vegertable oil
2 hot pepper (or some cayenne, perhaps?)
1 lemon

Blend with a blender. Steep overnight. Strain. Use 4 Tbsp per gallon of water.

Any thoughts or suggestions?