I don't really know how to get rid of it on the console if it's stuck. Is it there for more than one sim? Is it in one area of the lot or everywhere? I had a fire on my lot after a meteor strike, and I could not figure out why one area of the balcony was stinky. It turned out to be a tree. One time playing the console a plate of food some how got stuck between my sim and the refrigerator. It wasn't in the refrigerator or in her inventory, but boy was it stinky. I couldn't move or delete the frige because it said it was being used. I finally move the family out and back again and that worked. Look carefully around and see if you can find anything, but if there's no known cause, try moving out and back. You can sell your furniture and it will still be there when you move back. Good luck!