Rust isn't just unsightly—it also corrodes metal, weakening it over time. Luckily, if you catch rust early you can prevent its damaging effects. In fact, when life gives you lemons, you're already halfway to a rust-free home. Sprinkle a dash of coarse salt on the rusty metal, then rub a slice of lemon over the affected area. Let the salt-and-citrus cocktail sit for a couple of hours, then rinse clean. If the stubborn rust won't budge, repeat the steps using a fresh slice of fruit.