Raid Ant & Roach Killer 26 has a special formula that kills on contact and keeps killing with residual action for up to 4 weeks. This easy-to-use ant and roach spray can be applied to surfaces where ants roaches and other listed bugs may be infesting. Kills a wide variety of insects including Roaches Ants Silverfish Crickets Earwigs Household Spiders Multicolored Asian Lady Beetles Stinkbugs Scorpions and Black Widow Spiders. Fragrance Free – leaves no lingering chemical odor.