A method of treating the skin or hair on a dog containing an effective amount of an ectoparasiticide previously applied to the skin or hair, comprising applying a quantity of a cleansing composition directly to the skin or hair, wherein the treatment does not result in reducing the efficacy of the ectoparasiticide against adult fleas (C. felis) or adult ticks (R. sanguineus) below 90% efficacy for at least a month after application of the ectoparasiticide； wherein the cleansing composition comprises about 1-3 % glycerin； about 2-4% silicone copolyol esters, water and is essentially free of surfactant.
