I live in Southern California, and we have problems with an invasive (not native to our region) species of ants - the Argentine ant. Short of monthly professional extermination, I have never found an effective means of controlling them. Then I bought an aerosol can of Raid Max, and my ant infestation is permanently solved. I copied the technique of the professional I was paying. Here's how it works. While Raid Max will kill the insects it contacts, I don't even bother trying this. Instead, I spray a 4-8 inch barrier all around the base of my house on the outside. Ants can tell this is poisonous, and will not try to cross the barrier. Assuming the ant nest is somewhere outside of your house, the ants will stay outside. Any ants stranded inside will soon die or be killed. Their total life span is maybe a month. The number left alive drops off pretty quickly. Note that only the aerosol can will spray a mist that will create the effective 4-8 inch barrier. I use the "straw," and get a nice concentrated mist. The battery operated pump of the piece-of-junk containers only generates a very thin stream. Any small gap in that stream and the ants will get in. I have no knowledge of effectiveness on spiders, or on roaches or other insects.
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