My parents have a stench in their room and we can not identify it. It smells fishy. We have already tried changing the bed sheets, smelling the carpet, etc. They are clean I know that.
What is the problem and what can I do?
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I agree. It could be a dead animal of some sort. (ie; Mouse, Rat, Hamster, Possum, Neighbors cat, bat, bird.)
Does anyone in the family have any small animals or are their outside openings where an animal or bird could get into the walls or attic?
Or it could be a nearly invisible pet mess. A watery throw-up from a house cat?
Have you crawled around on the floor to see/smell if it is stronger by the floor, walls or ceiling?