The other night I was in a huge rush to get dinner on the table. I uncharacteristically put half an onion in the fridge without sealing it up in anything. Oh, how I hate fridge smells!
Fortunately, I had just read this article about unexpected uses for coffee grounds. I was skeptical, thinking that I would merely replace the onion smell with a coffee smell. But. . .it worked! I transferred my used coffee grounds from that morning in a bowl and left it uncovered in the fridge overnight. Now my fridge is completely odorless. Amazing!