This is such a great idea! I got tired of stinky garbage cans. I applied it just as the directions said. It kept falling off the lid. I dug it out of the trash twice. Gross!!
Then I decided I was done with doing that. Then I got another idea. The refrigerator !
So I applied it to the inside of the refrigerator. Now that is the ticket!! I works great in there. It really helps with odors. I have baking soda in there, but it doesn’t seem to work very well. But this really helps with strong odors such as onions. I will keep getting the refills for my fridge. I have another in my basement and one in my camper. They will be getting them as well. 
So no for the trash can, 
yes for the refrigerator.