Clearing a strong sewer gas odor in a bathroom requires identifying and fixing the root cause of the broken vapor barrier. First, pour a pitcher of water down the bathtub and sink drains to recharge any dry P-traps. Check if floor drain traps are dry and fill them with water. If the odor persists, inspect the base of the toilet for a compromised wax ring seal or check the roof vent stack for leaves and bird nests obstructing proper airflow. Verification: Ensure all drain traps maintain standing water to block rising sewer gases effectively.
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