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When you spray a roach, the chemicals, usually a mix of neurotoxins like pyrethroids or pyrethrins, start affecting its nervous system almost immediately. It disrupts the roach’s nerve signals, causing paralysis and eventually death. You'll often see the roach twitch, flip over on its back, and stop moving within seconds to minutes.

According to the National Pesticide Information Center, there aren’t any insect repellents registered for use against bed bugs that can be put on your skin. Some people may utilize diluted essential oils on their skin to try to repel bed bugs, but this is not considered effective for remedying the problem. The best way to repel bed bugs is to treat them with a non-toxic method to rid them from your home.

The signs of a bed bug infestation include itchy, red bite marks on the skin and various forms of physical evidence on or near your bed. Look for reddish or rust-colored stains on sheets from crushed bed bugs, as well as small, dark fecal droppings. You might also find the bugs themselves, their tiny eggs, or the pale, molted skins (casings) they leave behind. In some cases, a persistent musty odor may be present. If you notice any of these signs, calling a professional exterminator is the most effective way to handle the infestation.

There’s little scientific evidence to suggest that homemade remedies to ward off wildlife are effective. But, often, when using them alongside other management techniques, it won’t do any harm to try. Suggestions include using urine-soaked kitty litter or sweat-soaked clothing items. Try applying them around your fence perimeters. Always read the instructions carefully for any commercially-bought repellents and opt for EPA-approved products. Multiple applications, especially after rain, are often necessary.