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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.

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.

Like many animals, gophers are bothered by strong scents. Peppermint oil, eucalyptus oil,  and coffee grounds can be used as deterrents against these pests. Similarly, you can try planting lavender, rosemary, sage, geraniums, or pine trees, as these plants all have strong smells that can ward away gophers. While it may be less pleasant to work with, coyote urine scares gophers by tricking the pests into thinking your yard is a predator hot spot.

Small animals, particularly rats and mice, like to burrow inside pool heaters. To keep them out, seal any entry points with caulk or steel wool. Then, place mothballs inside or around your pool heater. As a final measure of protection, you can cover the pool heater in hardware cloth or wood paneling to further block entry points.