Mould keeps coming back after cleaning
Why it shows up again
You clean a mark and it reappears in the same place — often within weeks. That usually means moisture in the zone or on the surface is still an issue. It does not always mean structural disaster. In Barcelona flats, condensation, poor ventilation, cold corners and bathrooms with constant steam are very common.
We do not name the exact cause of every damp problem from one photo. This page helps you read recurrence more clearly and decide whether another clean, habit changes or surface work makes sense.

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