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Maybe it's the kid's pet upstairs that was dumped down the drain by mom and crawled out of your floor drain. Get some lime powder and sprinkle all the places you might climb in!
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You're in the places where the snails crawl and the surrounding areas are more humid.
Sprinkle dots. Lime powder, guaranteed to work.
Is there a crack in the pipe, there is gas.
It doesn't matter!
The third floor doesn't affect the second floor or anything. >>>More
After reading your supplementary explanation, it is safe to say: it is more troublesome. >>>More
It is still recommended that you go to the property first, as it is the responsibility and obligation of the property to find out the cause of the water leak and coordinate with you and the upper floor to deal with the problem.
If it comes from the sewer pipe, you can plug the pipe mouth when you don't use it.