A sudden, sickly-sweet rotten smell that seems to come from a wall, ceiling, or the attic is one of the worst odors a homeowner can deal with. In South Florida, it’s often a rat, mouse, squirrel, or other small animal that got into the house and died somewhere hidden. The heat makes the smell stronger and faster.
Signs It’s a Dead Animal
- A rotten smell that came on suddenly and keeps getting stronger for several days
- It’s strongest in one area: a wall, closet, ceiling or near a vent
- Flies gathering in one spot indoors
- You’ve heard scratching or noises in the walls or attic recently
- A stain appearing on the ceiling or wall
Step 1: Find and Remove the Source
No spray or treatment will fix the smell while the animal is still there. Call a pest control or wildlife removal company. They can find it, sometimes by cutting a small access hole, remove it, and seal the entry point so it doesn’t happen again. Don’t handle it with bare hands.
How Long Does the Smell Last?
If the animal can’t be reached, the smell may fade on its own over a few weeks, depending on the size of the animal and the heat. But even after the source is removed, the odor often lingers in insulation, drywall, carpet, furniture and the AC system, especially if the AC kept pulling that air through the house.
Step 2: Clean Up the Area
- Replace any stained or contaminated insulation or drywall near where the animal was.
- Change the AC filter.
- Wash fabrics in nearby rooms.
Dead Mouse Smell: What’s Different
A dead mouse is small, so the smell is usually more concentrated in one spot, and often in the kitchen: behind the fridge or stove, under the dishwasher or the cabinet kick plates, inside a cabinet wall or under a sink. Follow your nose low along the floor and check for flies. Mice that eat poison bait often die inside walls where you can’t reach them, so ask your pest control company about trapping instead if that keeps happening. When you find it, follow the CDC’s guidance: wear gloves, spray the mouse and the area with a disinfectant or a mix of 1 part bleach to 10 parts water, let it soak for about 5 minutes, pick it up with paper towels, and seal it in a bag (then a second bag) for the trash. Don’t sweep or vacuum droppings or nesting material, which can stir up dust. Wash the area afterward, and wash your hands even if you wore gloves. If you also smell urine, see mouse or rat urine smell.
Step 3: Clear the Lingering Odor
Once the source is gone, our whole-home odor removal treatment treats the air throughout the entire home, including one AC system, to remove the odor left behind. You’ll be out of the home for about 8 hours. It’s an odor treatment, so it works after removal, not instead of it.
The treatment also covers an attached garage at no extra cost, which helps when the animal was in the garage ceiling or a shared wall and the smell drifted into the house.
Curious how it works? Read how the whole-home odor treatment works, and what it can and can’t do.
Whole-Home Odor Removal in South Florida: $997
Our Whole-Home Odor Removal Treatment is $997 and includes one AC system ($550 for each additional AC unit). You can buy and schedule it online, or call 877-224-2532. We answer 24/7, and hablamos español.
About the author: James Rice-Peña is the owner of FL Cleanup and a Florida-licensed Mold Assessor (MRSA4035) and Mold Remediator (MRSR4158). He has worked in property restoration in South Florida since 2012, and FL Cleanup has earned 200+ five-star Google reviews.
