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Neem effects the hormonal cycle of parasites, preventing their reproduction, rendering their eggs sterile, and effecting their ability to feed. Add several tablespoons of Neem oil or Neem leaf powder to a warm bath and soak for 20 minutes. Scrub with a Neem soap or Neem shampoo. Liberally apply a Neem lotion, Neem cream, or Neem salve several times a day.