That good ol' garbage disposal needs attention every once in a while. I don't know why, but putting ice down the drain, then running cold water and running the disposal is the practice needed. I use about 3-6 cups of ice. I usually like to rotate the ice in my ice maker every few weeks, so I just dump that into the drain and then I am not wasting the ice and I have fresh ice all the time. If you want to add some freshness, add lemon peels.