Has anyone ever experienced a strong odor of rotten onions in just one place in the house? It is not the fridge, not the cat box, and not the trash bin. It has been going on for more than two weeks. If anyone has had this problem, do you know the cause and what has been effective in removing the noxious odor?
I've had the smell, even called the Health people in a rented house. It was a basement drain that needed a cover. They were backup sewer fumes.
Thanks for all the suggestions. The rotten onion smell was indeed a drip pan way in the back underneath the fridge. This pan had about a 1 mm thick layer of moist (but not wet) black slime in it, the smell of which just about incapacitated the poor guy that stuck his nose in there to see if that was the source of the smell. Probably should have sent a sample off to be tested at some toxin lab.
This is a page about cleaning a shower that has an onion smell. Sometimes a shower can have an onion-like odor. A bit of sleuthing can help you determine the cause and remedy.