I lufte my house twice a day but because of the high humidity, water droplets still form on the bottom of windows and mold started to grow. I used cleaning products and wine and an old toothbrush to scrub it but they didn’t help. Can someone recommend me a specific product?

Thanks and have a nice day.

by bicicletaro

7 comments

  1. You have to get the humidity down, but if you have bad windows that may not be enough. We used to live in a flat, where in winter we had around 45% humidity, but still water on the badly isolated windows.

    Only thing that helps is religiously wiping the water away every day.

  2. Are you sure it isn’t simply dust mixed with the water droplets? How fast did the mold reappeared after cleaning? Do you regularly wipe nearby the window?

  3. Look for Schimmelentferner at the supermarket. Even better, get one at the home improvement store since they are usually stronger and also have some layer of further protection

  4. More lüften if you have high humidity. Some flats are fine with twice a day, others need 4 times a day. Varies. If that won’t help, maybe invest in a dehumidifier. But also be thankful for the mold on the window, because it means your window is colder then the walls and the risk of mold in your walls is low!
    Dry the windows with a dry towel whenever you see water collect, most likely in the morning. Clean with vinegar and water and wait. I had this in the bedroom I grew up in and that was how I kept it at bay.

  5. You need to wipe those water droplets off before mold grows.

    After mold has grown use a chlorine cleaner to get rid of it. Try it on a small, non-visible spot of the window first.

  6. You can get different Schimmel sprays at places like Bauhaus or Hellweg. We had this problem too. New flat and our windows just rained water. It’s better now that we’re being proactive.

    Man musst Lüften! – the motto of our house. 😀

  7. Funnily enough, I had a consultation with a professional about this yesterday, because I have the same issue and reported it to my landlord.

    Your first step should be to report it to your landlord. Many rental contracts stipulate that you must inform the landlord about any mold as soon as possible. The landlord has a shirt to provide a safe living space to the tenant, so they’re obliged to fix this issue. The guy who helped us said you should use mold remover, then wipe it off with a cloth or paper, and then possibly paint over it, but this is the landlord’s responsibility and they will send someone over to do it for us.

    As for how often you open the windows to circulate air (Stoßlüften), I was doing this wrong. I was doing it 3 times a day with the window opened leaning inward. For proper circulation, you should open the windows fully, and do it in multiple rooms of the apartment. There’s no set time for it, but in higher humidity apartments, you should do this up to 8 times a day. The old rule about 2 or 3 times a day is outdated, due to a variety of factors like global warming, different building standards etc. After circulating the air, turn on the radiators for a few minutes if it’s very cold out.

    TLDR: Talk to your landlord about the problem, they should fix it. After it’s fixed, circulate the air much more frequently.

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