High deposition cleansing system

1. An insecticidal cleansing emulsion system, said cleansing emulsion system comprising:

a clear oil-in-water (o/w) emulsion wherein the oil phase contains an ionic surfactant, wherein the ionic surfactant is an anionic surfactant and wherein the anionic surfactant is a member selected from the group consisting of an alkyl sulfate and an alkyl ether sulfate; and

an insecticide suspended as nanometer sized particles in the water phase; and wherein said water phase contains a cationic polymer or surfactant, and a metal salt selected from the group consisting of LiCl, NaCl, CaCl 2 , MgCl 2 , MgSO 4 , NaOAc, KCl, KOH, KOAc, Na 2 HPO 4 , and NaH 2 PO 4 ; wherein upon dilution with water, said anionic surfactant and said cationic polymer or surfactant form a water-insoluble complex and said nanometer sized insecticide particles precipitate out of the water phase together with the water-insoluble complex.

2. The insecticidal cleansing emulsion system of claim 1 , wherein said insecticide is a pyrethroid selected from the group consisting of a natural pyrethrin, pyrethroid ester and a pyrethroid ether.

3. The insecticidal cleansing emulsion system of claim 2 , wherein said pyrethroid is a member selected from the group consisting of allethrin, cypermethrin, bifenthrin, cyfluthrin, cyphenothrin, fenpropathrin, deltamethrin, etofenprox, cyhalothrin, permethrin, phenothrin and combinations thereof.

4. The insecticidal cleansing emulsion system of claim 3 , wherein said pyrethroid ether is etofenprox.

5. The insecticidal cleansing emulsion system of claim 1 , wherein said system further comprises an insect growth regulator (IGR).

6. The insecticidal cleansing emulsion system of claim 5 , wherein said IGR is methoprene.

7. The insecticidal cleansing emulsion system of claim 1 , wherein said alkyl sulfate is a member selected from the group consisting of sodium dodecyl sulfate and ammonium lauryl sulfate.

8. The insecticidal cleansing emulsion system of claim 1 , wherein said alkyl ether sulfate is a member selected from the group consisting of sodium laureth sulfate, and ammonium laureth sulfate.

9. The insecticidal cleansing emulsion system of claim 1 , wherein said cationic polymer is polyquaternium.

10. The insecticidal cleansing emulsion system of claim 1 , wherein said nanometer sized particles are less than 500 nm.

11. The insecticidal cleansing emulsion system of claim 1 , wherein said insecticidal cleansing emulsion system is homogeneous.

12. The insecticidal cleansing emulsion system of claim 1 , wherein said insecticidal cleansing emulsion system further comprises a synergist.

13. The insecticidal cleansing emulsion system of claim 1 , wherein said metal salt is NaCl.

14. The insecticidal cleansing emulsion system of claim 1 , further comprising an antioxidant.

15. The insecticidal cleansing emulsion system of claim 14 , wherein said antioxidant is selected from the group consisting of Vitamin E, Vitamin A palmitate, ethoxyquin, propyl gallate, butylated hydroanisole (BHA), butylated hydroxytoluene (BHT), and combinations thereof.

16. The insecticidal cleansing emulsion system of claim 15 , wherein said antioxidant is butylated hydroxytoluene (BHT).

17. The insecticidal cleansing emulsion system of claim 1 , further comprising an emollient.

18. A method for eradicating insects on a pet, said method comprising:

administering an insecticidal cleansing emulsion system of claim 1 to a pet,

wherein upon dilution with water, the anionic surfactant and the cationic polymer form a water-insoluble complex, to eradicate insects on said pet.