How can I safely use lemon juice to deter my cat from scratching furniture?

To safely use lemon juice to deter your cat from scratching furniture, mix equal parts lemon juice and water in a spray bottle and lightly mist the areas your cat likes to scratch. Cats typically dislike the smell of citrus, which can discourage them from scratching. Be sure to test a small, inconspicuous area first to ensure the lemon juice does not damage the furniture.