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Using chemicals with harsh odors is a natural way to repel bears. While the animal’s strong sense of smell is an asset in the animal kingdom, it’s a weakness here. Simply place bleach or ammonia in a bucket and leave it outside day or night. Ironically, bears also dislike the smell of pine, so you can use pine oil or a pine-based cleaning agent. Avoid using cleaning products with fruit or citrus smells, however.

Squirrels hate anything that disturbs the peace in their nest. Loud noises, bright lights, and strong smells like cayenne pepper or mothballs will deter them from your attic. Spread these scents, add a strobe light, or use an ultrasonic repeller to keep squirrels from nesting in your attic.

There's anecdotal evidence that apple cider vinegar does help to repel mice. But the best way to repel mice is to keep your home scrupulously clean and seal up any obvious entry points. If you already have a mouse infestation, apple cider vinegar won’t get rid of the critters. It’s usually worth the cost of professional pest control to make sure a serious mouse problem is eradicated completely.

Regular cleaning, proper food storage, sealing entry points, and professional inspections help prevent infestations.