There is usually some way you can use an essential oil, even if it has ‘expired’, so if one or more have oxidised you could make your own household cleaner. Alternatively, use a couple of drops in the drain, toilet or to freshen up the bin. Avoid using oxidised essential oils in diffusers, burners or room sprays, as the aromatherapeutic properties will no longer be present and they could irritate or inflame your skin.