Charcoal as deodorizer
When your refrigerator has run out of its deodorizer, you may replace it with charcoal. Charcoal is a porous material. It absorbs water and gases. That is why it can be used to eliminate bad odors in your refrigerator.
You may also use charcoal to eliminate unlikable odors in your bathroom. And since it can also absorb water, you may use it to remove unnecessary moisture in your bathroom which could prevent the cultivation of molds.
Charcoals are cheaper than commercial deodorizers if you are running on a tight budget and they could get the job done. They are just as effective and viable.