Insecticide spray comes in handy when cockroaches surprise you — or when you don't want to get too close. Sprays like Raid kill roaches and other pests on contact, but they can leave a poisonous residue behind. Try spraying outdoor concentrates around your home's exterior to control current infestations, and to repel newcomers.
Be careful with fog or pesticide bombs. They aren't as effective, and roaches can develop an immunity to poisons or behave unpredictably as a side effect.

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