The Many Uses of Coffee Grounds - Part 1

Deodorize your fridge

After your coffee is brewed, put the grounds to work again—this time as a powerful odor absorber inside your fridge. Leaving a bowlful of used grounds in the fridge overnight will rid your icebox of icky odors, according to Apartment Therapy. Repeat as often as you'd like. If you're battling particularly potent odors, feel free to leave the grounds in the fridge until the job is done.

Info from Grandparents.com