Mainstays Charcoal Odor Eliminator for Closets, Fragrance‑Free, 17 oz, 6‑Pack

Do not sleep on these. I literally put these out last night (my second round) and the smell was gone this morning. They work so well I always have a backstock of them. This is my second 6 pack. These are perfect for next to the litter box, under the sink, in the closet, by the hamper (name it). They last for a long time too Honestly, they don't really smell like anything. If you really try you can make out charcoal but they're not going to add a scent to the space, just remove nasty ones. They immediately wipe out the scent of rot while we wait to replace old cabinetry. Just be careful when you take the top off, there is a little bit of liquid in there and that can splash, easy to clean up if that happens though.

My neighbor filled the hallway of the sixth floor apartment building I reside in with smoke from overcooked food. The smell was terrible. I bought this hoping they would work. They did! I placed two in the hallway and the rest in my apartment. It took about three weeks because the smoke had been very thick. The fire department had to suck it out with a machine. But they work!!! Highly recommend!!!