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The most effective natural roach repellent is Borax with its key ingredient of boric acid and diatomaceous earth. But some homeowners may not feel like these are “natural” enough, especially since you can’t use Borax around curious pets or toddlers.

On the other hand, studies have shown that oregano oil mixtures have some of the best repellent effects, and other research indicates that catnip oil, peppermint oil, and citrus oils have notable effects on keeping roaches away. Rosemary oil has been shown to be the most effective natural oil for killing cockroaches outright.

Typically, fleas won’t take up residence in human hair. Their natural preference is to live on the fur of animals, but they can bite and infest humans on a temporary basis. If there is a significant flea infestation in the surrounding environment, humans may inadvertently become a host. Again, though, this is a rare occurrence.

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.