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Please remove the green moss first. Speed up drying. Don't know how thick your walls are. Isn't it all soaked in water. What about ventilation? If you wish to dry quickly. You can use a fan to dry it, so it's faster. FYI.
Having a wall across it doesn't affect anything at all.
Why do you want to deal with it! >>>More
Negotiate directly with your neighbors and fix the leak as soon as possible. >>>More
Look at the facts and evidence.
You bought a second-hand house and there is a leakage of water next door to your house, encounter this kind of problem, you can find the neighbor next door to coordinate and solve, I believe that the quality of most residents is still quite high, if you really encounter unreasonable neighbors, you can go to the local neighborhood committee to reflect the situation, or you can also seek help from the media.
The bathroom leaked to someone else's house, it must have been decorated when the waterproof was not done.