Homemade fly sprays are gentler than commercial sprays. They are often used on large livestock, such as horses, to kill flies without harming the animal or irritating its skin. Make a homemade fly spray for use around the house when flies become a problem. Most homemade fly sprays do not contain synthetic chemicals, allowing you to use them without concern for strong chemical odours.
Vinegar fly spray
Mix together 414 ml (14 oz) apple cider vinegar, 118 ml (4 oz) baby oil, 59 ml (2 oz) tea tree oil and 29.6 ml (1 oz) citronella oil in a large bowl. Pour the mixture into a spray bottle. Spray flies with the mixture kills them. Spray the solution onto animals that attract flies or around house doors to deter flies from coming near.
Epsom salt fly spray
Dissolve 68 g (1/4 cup) Epsom salts in 118 ml (1/2 cup) of hot water. Pour 118 ml (1/2 cup) of apple cider vinegar and 59 ml (1/4 cup) body oil into the mixture. Mix the ingredients well. Pour the solution into a spray bottle. Spraying the flies kills them. Spraying around doors and windows deters flies from coming into the house.
Pyrethrum powder spray
Pyrethrum powder comes from the flower of certain chrysanthemum species. The chrysanthemum flowers contain a volatile oil that kills insects, and pyrethrum powder is often used in insecticides. Create the spray by steeping 28.4 g (1 oz) of pyrethrum powder in 4.5 litres (1 gallon) of hot water. Spray flies in and around the house to kill them.
Quassia wood fly spray
Make a homemade fly spray with quassia wood chips. Quassia chips are sometimes used in herbal remedies and are found in some health food shops. To create the spray, soak 198 g (7 oz) wood chips in 2 litres (2 quarts) of water for 12 hours. Bring the solution to a boil and then strain into a spray bottle. This acts as a common insecticide and kills flies and other bugs.