A simple spray made with Dawn dish soap is all that most homeowners need to rid their yard and pet of troublesome fleas. Fill a garden sprayer with water and 1 oz of dish soap. Spray all over the garden in the evening. Repeat every 10-12 to kill flea eggs that may have survived but not hatched yet.Click to see full answer. Beside this, does Dawn dish soap kill fleas in the yard?Dawn Dish Washing Liquid is a natural way to control fleas in yards. The soap coats the fleas and kills them. It is easy to use, effective and cheap.Beside above, how do you kill fleas with Dawn? Bathe your pet using Dawn dish soap of any scent. Fill the tub with warm water and pour in ½ to 1 cup of Dawn. Soak him in the soap and water for at least five minutes. Use the Dawn to lather and clean your dog, cat or any other flea covered furry friend, starting at the ears and working your way to the tail. Also question is, what can I spray in my yard to kill fleas? Nematodes kill fleas in their pupae, larval, and pre-adult stages, providing a natural method for keeping the pests under control, according to MotherEarthNews.com. They are specifically sold for yard pest control and infestations; just mix them with water, and spray or sprinkle them on your lawn.Can you use any dish soap to kill fleas?As I said, dish soap (or any shampoo) will likely remove any fleas that are on your pet at the time of the bath. The best way to get rid of fleas is to use a safe and effective flea preventative from your veterinarian on EVERY pet in the house and outside for AT LEAST 3 MONTHS.