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It depends on whether there is a special explanation of the maintenance clause in the contract you signed, if not, the landlord bears it.
The toilet is a place that is often damp, and the installation of the socket needs a moisture-proof cover, as well as the measurement of power, it is recommended to find a decoration person to install, and the cost is about 100.
The back of the refrigerator will volatilize moisture, causing your wall wallpaper to have mildew. If you look closely, your wallpaper should show signs of water stains or mildew.
If it is not caused by you, but the problem of the house itself, the landlord will compensate for it. Experience it for yourself.
Is the sand in the pipes blocking the pipes? Remove the net of the faucet and check it.
It's best to wait until there is no smell at home.