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Clean it up, I'm someone who's seen a toilet gas explosion, it's scary, so whether it's for personal safety or not, clean it up.
If you confirm that the electrical wiring is fine, is it possible that it is the smell of someone else's home in the public exhaust duct?
To remove the odor in the bathroom, you can take the following methods: Use toilet cleaner as a dredging agent: pour an appropriate amount of toilet cleaner into the toilet every once in a while, close the toilet lid and let it sit for a while, and then rinse it with water to keep the toilet unobstructed.
The smell that comes back through the floor drain is generally not dangerous. This problem can be solved by installing an odor-proof floor drain.
Check the water outlet of the hot water faucet, if it is small, it should be a problem caused by the surface scale of the temperature measuring probe of the hot water port. >>>More
Sewer odor Buy a good floor drain and pay attention to cleaning it usually.