Black Flag Dry Ant & Roach Killer controls roaches, ants (excluding pharaoh ants and fire ants), carpenter ants, spiders, crickets, firebrats and silverfish with quick-killing action. Use this non-staining, dry formula indoors to flush listed insects out of cracks and crevices and kill them on contact. Keeps controlling German cockroaches for up to 6 months. Spiders (including black widow and wolf spiders) must be sprayed directly to be killed. Leaves no odor behind. Use the extension tube to direct spray into cracks and crevices in walls; dark corners of rooms, cabinets and closets; along and behind baseboards; beneath and behind sinks, stoves, refrigerators and cabinets; around plumbing and other utility installations; around waste containers and wherever else these pests may find entrance. Use along and behind baseboards, appliances, sinks, pipes and plumbing.