Fresh N Clean Flea and Tick Shampoo kills adult fleas and ticks on dogs. Although this shampoo does not kill flea eggs the products residual will weaken the fleas once the eggs hatch. Use regularly for best results. Fresh Clean scent lasts up to two weeks. Fresh N Clean Flea and Tick Shampoo will not kill flea eggs. The products residual will weaken the fleas once the eggs hatch. Directions: Wet the coat with warm water. Apply the shampoo along the back of your pet and work the shampoo well into the coat. Do not get lather into the eyes. If it accidentally gets in the eyes quickly wash them out with clean water to prevent irritation. Allow lather to remain on the pet for 5 minutes to permit the insecticide to take full effect. Rinse thoroughly.