Very useful. I had a lingering cat litter odor, and removed it from the container to see if it could handle it. It took away what even scrubbing couldn't. It does have s very short shelf life, though.
I use this in my closet, as I think it has that stuffy closet smell. It has helped a bit but not as much as I would have liked. They did say to take it out of the container for larger smells, but I thought that would get messy.