Web Out is exempt from the Federal Insecticide, Fungicide & Rodenticide Act (FIFRA) 25(b), which means it’s a minimum-risk product. Made from a blend of biodegradable essential oils and vinegar, it repels and kills spiders and other perimeter pests such as ants, crickets, mosquitoes and cockroaches on contact. It helps to control spiders by eliminating adults, as well as easing removal of spider webs and egg sacs. It also helps prevent future web formation on treated surfaces up to 60 days outdoors, depending on weather exposure. Web Out can be used around water, including boat docks and marinas.