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You should not spray pesticides of any kind into your air vents. The spray won’t reach far into the vent, minimizing its effectiveness in killing roaches, but more importantly, it’s dangerous for people and pets to inhale these chemicals. Roach spray is not a natural roach repellent, and it’s not safe to spray into air vents.

If you’re heading outdoors, wear long sleeves and pants to minimize skin exposure. You may also want to wear clothing and any additional gear, like backpacks or tents, treated with 0.5% permethrin. If you’re dealing with fleas at home, you may want to wear insect repellant and vacuum your bed, carpets, and upholstery frequently to minimize fleas.

For a minor infestation, you can expect to clear up a German cockroach problem in about two weeks. That’s usually enough time to confirm that they don’t have additional hiding spots and aren’t continuing to encroach from an outside source. If you have a major infestation and use the services of a pest control company, it can take several weeks and multiple visits to fully clear your home, up to a couple of months.

According to the U.S. Environmental Protection Agency, pyrethrins and pyrethroids are the most common chemical compounds used to get rid of bed bugs. These chemicals force bed bugs out of their hiding spots and kill them on the spot so they are eliminated for good. Only professional exterminators can apply these treatments, and they are reserved for severe infestations.