Mould in Your Berlin Apartment? Why Deep Cleaning and Steam Make the Difference

Black spots behind the wardrobe, a musty smell in the bathroom, grey edges around the window frame. If you live in Berlin, especially in an Altbau with thick walls and old box windows, you have probably seen mould at some point. It is one of the most common problems we are called in for, and one of the most misunderstood.

Why mould keeps coming back

Mould needs moisture. In Berlin apartments, that moisture usually comes from everyday life: cooking, showering, drying laundry indoors, and cold outer walls where warm air condenses. Wiping the visible spots with a spray only removes the surface. The spores and roots stay in grout, silicone joints and wall corners, and the patch returns within weeks.

What a proper mould clean looks like

A real mould treatment is part of a deep clean, not a quick wipe. We clean the affected surfaces thoroughly, work into the joints, corners and window seals where mould hides, and clean the surrounding areas so spores are not left behind to spread. Bathrooms, kitchens, window frames and the walls behind furniture get particular attention.

Why we use steam

Steam is one of our most effective tools against mould. High-temperature steam reaches into grout lines, silicone edges and window seals where cloths cannot, and it kills mould on hard surfaces without relying on harsh chemicals. That makes it a good choice for homes with children, pets or anyone sensitive to strong cleaning products. Tiles, grout, window frames, sinks and shower areas all respond very well.

Steam is not the answer for every surface, and we will tell you honestly when that is the case. Wallpaper and some painted walls do not handle heat and moisture well, and mould that has grown deep into plaster or old silicone may need the material replaced rather than cleaned. After steam cleaning we always ventilate the room so the extra moisture does not become part of the problem.

Keeping it from coming back

Cleaning removes the mould; your daily habits keep it away. A few simple things help a lot: airing out fully with windows wide open for 5 to 10 minutes several times a day (Stoßlüften), rather than leaving a window tilted; keeping furniture a few centimetres away from outer walls; and running the extractor fan or opening a window after every shower.

When to call a specialist

Small, surface-level patches can be cleaned effectively. Germany's Federal Environment Agency (UBA) recommends professional assessment for larger areas, roughly more than half a square metre, or when mould keeps returning despite good ventilation. That can point to a structural issue such as a leak or thermal bridge, which is something to raise with your landlord.

Moving out with mould?

Mould stains are a common reason for deposit deductions. We combine move-out cleaning with mould treatment and, where needed, wall touch-ups, so the apartment is handed over in good condition.

Book with BerlinCleaner

English-speaking team, flat-rate pricing, €5M liability insurance, and a 4.9-star rating on Google. Send us a few photos on WhatsApp at +49 176 61054647 and we will give you a quote.