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Combine 1/2 oz (15 mL) of neem oil with 1/2 tsp (2 1/2 mL) mild soap. Mix the neem and soap into 2 quarts (2 L) of warm water. Pour the pesticide into a spray bottle.

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Mix the 2 ingredients together in a bowl. You can get neem oil in most grocery and health food stores, as well as online. Use a mild soap like Dawn or castile soap for the best results. Neem oil, which comes from a bitter tree leaf, is thought to be one of the most effective natural pesticides in existence. Fill a large container with the water, then add the oil and soap mixture to it. Stir slowly until the ingredients are thoroughly mixed together. Transfer the solution to a spray bottle with a funnel. Spray the pesticide immediately, dousing the entire plant and focusing on spots where you can clearly see pests or signs of pests. Re-apply the pesticide regularly to prevent any infestation.