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Anecdotal evidence suggests coffee grounds can keep chipmunks away. Sprinkle them throughout your garden, yard, and plants to help deter them. As an added bonus, coffee grounds can help keep the slugs away, and they’re great for acid-loving plants such as hydrangeas, azaleas, and rhododendrons.

Some stores sell smoke bombs to drive animals out of spaces, but we don’t recommend you use them, especially in an attic. The smoke can be toxic to humans or pets that may accidentally inhale it. Meanwhile, critters can easily escape the smoke by temporarily leaving the attic, only to return via their usual entry points after the smoke clears.

Deers have an extraordinarily strong sense of smell, which means they can react strongly to certain scents. Lavender, garlic, mint, cinnamon, clove, and human hair are some of the most offensive scents for deer. You can try mixing some of these pungent oils or scents with a spray mixture and adding them to your garden.

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.