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Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Set live traps or install a one-way door to evict squirrels, rodents, and other animals from your attic. Once they’re out, seal any entry points to prevent the animals from returning. If you’re dealing with an infestation, call a pro. 

Although raccoons aren’t particularly picky regarding food, certain sounds, metals, and smells bother them. You can place these items around your home to keep raccoons away:

• Place wire mesh screens around and underneath decks and porches to prevent raccoons from nesting. 

• Put metal sheeting around the edges of your roof or at the base of trees to deter raccoons from coming close. 

• Place a loud battery-operated radio near the raccoon’s den to keep them from nesting.

• Keep a bowl of cider vinegar on your deck or porch.

• Remove old raccoon scents by thoroughly cleaning and disinfecting underneath porches and decks.

If you’re having trouble with your traps, first examine them for flaws that would allow a squirrel to escape easily, such as loose doors or hinges. It’s also important to consider the location of your trap: Place it in areas with higher squirrel traffic, and make sure it’s on a sturdy surface so it can’t wobble or tip (squirrels aren’t likely to walk in a trap that isn’t stable). Lastly, try changing out your bait—in-shell peanuts or peanut butter often work best.