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Take a few preventative measures to prevent mice from chewing your car wires. First, consider adding a few drops of a taste deterrent, such as pine-based floor cleaner or peppermint oil. Also, regularly starting your vehicle, even if you don't drive it frequently, can discourage rodents from nesting in the engine bay, as they prefer quieter and sheltered environments. Finally, consider leaving your car's hood up at night when parked in a garage, which makes the engine bay less inviting for rodents as it becomes less dark, warm, and comfortable.

Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.

While foxes may find them unpleasant, mothballs are not an effective deterrent. Additionally, mothballs are toxic for humans and animals and should never be used outside. They contain naphthalene or paradichlorobenzene, which are very harmful to the environment. Use safer, more reliable deterrents, or hire a professional wildlife control expert.

As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.