Yes, they are fairly effective for killing fleas but due to the toxins they release, I recommend only using them when the flea situation is very bad. There are also a few other problems like: Flea bombs will not kill the fleas on your pets!Click to see full answer. Accordingly, do flea bombs kill fleas instantly?Flea bombs, also called flea foggers, spray a dense cloud of insecticide, which quickly kills adult fleas and other insects. These foggers are easy to use, but you, your pets and your children need to leave the home for a few hours while the fogger does its job.Additionally, do flea bombs kill eggs? Flea bombs use chemicals that kill fleas, and some also kill flea eggs. Ones that also kill eggs can completely eliminate an infestation with a single treatment. Most foggers use the following active ingredients to kill these pests: Pyrethrin. how long does it take for flea bombs to work? We recommend giving it at least thirty minutes for the treated area to properly air out.What kills fleas instantly? Flea home remedies Dish soap. This home flea remedy involves creating a flea trap using dish soap and some water. Herbal flea spray. Rapid home remedies suggest using an herbal flea spray to get rid of fleas from your home. Baking soda. Salt. Lemon spray. Diatomaceous earth. Rosemary. Flea repelling plants.