Basements often lack proper air circulation that can breed mold and mildew. This is a guide about removing odors from a basement.
I have the smell of rotten onion in my basement, we can't find the source. Do you have any suggestions?
I googled "rotten onion smell in basement" and got some really good articles, including one from here in 06. I hope that helps.
Could this be an animal marking its territory, or nesting? I have cats, so don't have such issues. An animal in your case might even be a snake, since they may deposit odors. It is winter and animals seek the warmth of the indoors. I hope you figure out what it is. It seems like an animal must be the source.
Check to see if you have any dry sink or bath tub drains. If you have a bathroom or wetbar sink that isn't used regularly, a dry trap can let sewer odors back into the home. Do you have a dry sump pump? Same problem. Do you have any plants in water vases? If water is not changed regularly, roots begin to rot and stink. Are you storing any root vegetables that might be going bad?
How do I remove pet odor from a concrete basement floor?
By Ann from Indianapolis, IN
Use the "Pee Recipe" - it's not just for pee.
2 c. peroxide
2 t. baking soda
2 small drops liquid dish detergent
Mix gently and then pour on area. Do not wipe up - let it dry on it's own, undisturbed, for however long it takes. The smells will be gone. You can use this on dog, cat, human urine, feces, vomit. On carpet (test for colorfastness first in an inconspicuous area), mattresses, concrete, etc. Using a watering can (with sprinkler top) helps to distribute more evenly.
My son is selling his house and the basement has a horrible dog odor from where the dogs were kept. Can anyone suggest a solution I can apply to neutralize the smell? The area has a concrete floor.
Rose from Malvern, PA
You can buy a product called OdoBan. Wal-mart sells it in a spray bottle, or you can get it at Sam's in gallon jugs of concentrate. Either way, spray it liberally on the floor and let it set for a few minutes before you mop it up or hose it off. It might take a couple of times, and I'd just leave some on the floor to dry when you finish. It has a pleasant, clean scent. Good luck! (04/08/2008)
You can try sprinkling the area with a liberal amount of baking soda and letting it sit overnight. Then vacuum or sweep the next day. Follow that with 2 cups of white vinegar mixed with 1 gallon of water. Mop the floor, then rinse.
A second or third round of treatment may be required if it's really bad. But I had good luck with this. (04/08/2008)
Put a few sheets of foil or newspaper down with charcoal briquettes laid out on it. Better yet, smash up the charcoal (outside) down to marble-size chunks first. (04/12/2008)
Try spreading coffee grounds on the floor. Fresh grounds, not used. We had a problem with cat odor and it helped a lot. Leave it there as long as it takes. (04/13/2008)
I have a dog that sometimes makes a mess in the basement on the concrete floors. When this happens, I wash the floor with bleach and hot water. Smell is gone and the floor is nice and clean.