Put garlic, peppers, oil, soap, and water in a blender and blend on high for several minutes.
Leave in a bowl or pitcher overnight or for at least 12 hours to intensify the effects of the garlic and peppers.
Strain through a towel, cheesecloth, or strainer and store in a glass jar.
To use, pour about 2 Tablespoons into a 16-ounce spray bottle (or 3 TBSP in a 24-ounce) and shake well.
Spray directly on plants as needed… I recommend wearing gloves!
Use as often as needed for preventative and pest-controlling effects.
Notes
If you don’t want to make your own they do make store-bought natural pepper sprays but I prefer the homemade version to avoid the paraffin wax they contain (made from petroleum). That said, it’s still better than spraying your garden with pesticides! Just be sure to wash produce well and also use a vegetable wash.