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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.

Sure, they are icky to behold, but are silverfish bad? In terms of illness or injury to humans, the answer is no because they don’t bite or carry disease. However, they can damage household items, including books, wallpaper, certain foods, and clothing, as they love to feed on starchy materials and adhesives. What’s more, their presence often indicates high humidity or moisture issues in the home, which can lead to further pest problems.

It is highly unlikely that fleas will go away on their own without treatment. Female fleas can lay dozens of eggs per day—up to 50—causing their numbers to multiply quickly and spread throughout your home. An adult flea can live for around 100 days or even up to a year as long as it has access to a host, such as a pet or human. Even without a host to feed on, fleas can survive for weeks. Because of their rapid reproduction and resilience, it's best to tackle a flea problem as soon as possible. Hiring an exterminator is recommended to prevent the infestation from worsening.

You can use commercial repellents to help deter rodents, but they often have mixed results. A better solution is preventing rodents from getting under your home in the first place. Using steel wool or foam sealer, plug all potential entry points like gaps and cracks in the foundation. 

Also, consider installing hardware cloth or wire mesh over vents, utility openings, and any openings under the porch or foundation. Regular inspections and maintenance will aid in early detection and prevention, ensuring a rodent-free environment beneath your house.