Can sewer gas fumes mar your robustness - our plumber can't even digit out where on earth the smell is coming from.?
Answers: It may be coming from an clear floor drain or some other drain that needs to be flushed to restock the sewer gas trap beneath it. You mention wash..check the wash machine also..it may only just have a loop contained by the drain hose for a trap.. The odor is coming back into your house from the sewer system..shouldn't be tough to find.
Clean your drains.
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