If, as a tenant, you notice "damp, fogged-up windows

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Proper ventilation (shock ventilation / cross ventilation) and increased heating can help here. If the "musty, wet corners" persist, this is more likely to indicate a construction defect. In this case, you should definitely seek expert advice.

In new apartments, you should also not push the furniture all the way up against the wall and you should not hang pictures on the walls. The decision to install wooden skirting boards should also only be made after measuring the "residual building moisture". New buildings are generally "wet" and need a few weeks/months until the excess moisture has finally escaped from the building. Therefore, these "apartments" must be able to breathe. Ventilation and the measures described above must be strictly observed.

Modern apartments/houses are almost "airtight" austria mobile database and built very compactly. Air exchange through gaps, cracks, and the masonry is almost impossible or extremely difficult. This is why ventilation systems are usually used.

How to remove mold?
Even if the landlord should generally remove the mold, you can also remove the acute mold infestation in the apartment yourself with a few tools. To do this, you can of course optimize your ventilation and heating habits. You should also close the bathroom door after showering, for example, so that no moisture gets into the rest of the apartment. You can use the following substances as home remedies:

70% alcohol: simply dab and rub the moldy areas with a cloth soaked in the alcohol solution. Be sure to wear gloves and a respiratory mask.
Hydrogen peroxide. You can also use this to rub off the mold. If necessary, you can also use methylated spirits. In any case, you must always ventilate sufficiently and protect your eyes.