The Economic Times

Why are people keeping an open jar of used coffee grounds in the fridge? The surprising reason

Keeping dried used coffee grounds in an open jar inside the refrigerator may help reduce lingering food odours. Coffee grounds have porous properties that can adsorb certain volatile compounds, while the USDA also lists coffee grounds as one option for tackling refrigerator smells. However, damp grounds can encourage mould, so they should be dried thoroughly first. The trick works best alongside regular cleaning and removing spoiled food from the fridge.