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A rodent infestation often has a distinctive, unpleasant smell. The most common odor is a strong, musky scent, similar to stale ammonia, which comes from mouse urine. As the infestation grows, the smell can become more intense. You might also notice a foul, decomposing odor if mice or rats die inside the walls or hidden areas. This combination of smells is a clear sign of a rodent problem and should prompt immediate action to address the infestation.

Always begin by removing the gnat's source of food. Toss rotting fruit, place new fruit in the fridge, and switch the soil of your houseplants. 

The best way to get rid of gnats in the kitchen is by baiting and trapping them with something sweet. Combine water with a few drops of dish soap, apple cider vinegar, and 1 tablespoon of sugar into a bowl. Cover with plastic wrap and poke small holes to trap the gnat in the liquid.

Squirrels have a strong sense of smell and can be deterred by various scents they dislike. Effective options include peppermint oil, rosemary, garlic, cinnamon, white vinegar, coffee grounds, and predator urine. Squirrels also have a strong aversion to capsaicin, the compound that makes chili peppers hot, making capsaicin-based repellents a good choice for protecting specific areas like gardens or bird feeders. For a DIY solution, you can create a garlic and vinegar spray and apply it daily. Additionally, placing strong-smelling items like certain soaps or dryer sheets near where squirrels frequent can also be effective.

It’s debatable, but most will say either termites or bed bugs are the hardest to remove. When dealing with termites, you must find the central nest (as opposed to satellite nests) and exterminate the queen and all potential queens, which often takes the work of a specialist. Bed bugs, meanwhile, are incredibly hardy, good at hiding, and resistant to pesticides, so it takes very careful, very thorough work to get rid of them permanently.