Keeping your fridge odor-free can be achieved easily with a two-ingredient solution: baking soda and coffee grounds. Baking soda, when placed in a vented jar, works by neutralizing acidic odors through a chemical reaction, making it a natural and cost-effective alternative to chemical sprays. It typically takes at least 24 hours to absorb odors, but stubborn smells may require several days. For an added boost, you can combine baking soda with essential oils or other natural ingredients like vinegar or citrus peels. Coffee grounds are another excellent option for absorbing odors, thanks to their porous texture and nitrogen content, which helps eliminate sulfur gas. Users recommend drying used coffee grounds before placing them in a bowl in the fridge to avoid mold growth. Together, these two ingredients can keep your kitchen smelling fresh without the need for harsh chemicals.