A home that smells fresh makes a difference the moment you walk through the door, but plenty of store-bought room fresheners only cover up odours with strong fragrance, and some people find them irritating. The good news is that you can keep a house smelling clean with ordinary ingredients you probably already have, such as citrus peels, baking soda, herbs and flowers. These methods are gentle, cheap and quick to try. The key is to remove the source of a smell and then add a light, natural scent on top. Here are five easy ways.