Anyone with an aquarium knows the importance of having a supply of activated charcoal on hand to keep the fish tank fresh. Even if you don't keep fish, it's worth a trip to the pet store to pick some up. Why? Activated charcoal (unlike regular barbecue briquettes) has very small pores that are supercharged in their ability to absorb things. This includes odors! So fill a bowl with activated charcoal and place it wherever it smells musky or bad, like a refrigerator or closet, for a natural way to deodorize.