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There are several ways to dry out flea eggs. Diatomaceous earth (DE) is a natural ingredient that can dry out fleas, but it’s messy to apply and can also cause respiratory issues for members of your household if inhaled. Salt is safer and easier to apply, so shake it liberally over affected areas. Boric acid is another way to get rid of fleas and other insects, but this, too, can cause respiratory issues and health problems if inhaled or ingested.

Scorpions are repelled by strong scents like lavender, cedar, peppermint, and cinnamon. Applying essential oils of these scents mixed with water around your home's perimeter and entry points can act as a mild, chemical-free deterrent. In addition to scents, scorpions also tend to avoid well-lit areas, preferring to hide in dark, cool, and damp places during the day. However, it's important to note that these methods are not fully effective on their own and should be combined with other preventative efforts, such as sealing any potential entryways into your home.

Experts have mixed opinions about spraying spiders. A recent study found that chestnut and peppermint oil have a repelling effect on some spider species, but were ineffective at repelling others. You should consult with an expert exterminator to find out what works best to repel the spiders living in and around your home.

The best deterrents for possums include securing trash cans with tight-fitting lids, removing outdoor food sources like pet food or fallen fruit, and trimming tree branches that provide access to your roof or an open window. Motion-activated lights or sprinklers can also startle and discourage them from visiting. Additionally, you can take advantage of their strong sense of smell by using garlic, onion, or commercial possum repellents to keep them off your property.