I’d add water to your laundry room sink. I know your first thought may have been the dryer, but many of us don’t use the laundry room sink. If the water evaporates out of the p-trap in that drain, you can get sewer gas into the laundry room. Just a thought. Dump about a quart of water into the laundry room sink and see if the odor stops. Same holds true for the guest bathtub if it goes unused for several months.
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