Guide
Bathroom mould in Barcelona: what to check before treatment
Bathrooms are where mould shows up most often: above the shower, in silicone joints, in corners, on a wall with no window. Here is where to look, what to check yourself and when it makes sense to send photos on WhatsApp.
Where it usually appears
What you can check yourself
When to contact us
You can write in English — we reply in English. We usually reply quickly. If we are on a job, it may take up to 2–3 hours.
Why bathrooms get mould more often
Steam after a shower, temperature swings, weak ventilation, old joints and silicone, a ceiling that catches condensation. That does not mean every bathroom is a disaster — simply that conditions here suit mould.
NoMoho does not name mould species, give medical opinions or promise it will never return. Below is what you can check yourself and when it makes sense to book treatment in Barcelona.
Where it usually appears
- the ceiling above the shower — steam rises and settles
- silicone joints by the bath, shower and sink
- the top corner of ceiling and wall, especially with no window
- the wall by the shower or behind glass
- the line where ceiling meets wall on a cold exterior wall
- near the extractor, if it is weak or blocked
The place changes the picture: a mark above the shower is not the same as a corner far from water or a wall shedding paint.
What to check yourself
Paint. If it holds well and the mark is small, the case may be superficial. If it bubbles, spreads or peels when wiped, a cloth alone is not enough.
Joints. Darkened, cracked or detached silicone is a separate issue. Water sits underneath and washing does not help for long. Sometimes the joint needs replacing, not only cleaning.
Ventilation and habits. Is there a window? Does the extractor run after a shower? Do wet towels hang for hours? That is context, not blame — but it affects how long any repair lasts.
Gentle cleaning without risk
A small mark on sound paint often responds to calm cleaning: gloves, a mask, a soft cloth, warm water, neutral soap or a mild cleaner. For joints — a soft brush in corners, without scratching tiles.
Better not to:
- mix strong cleaners (especially bleach with other products) — unsafe
- pour chemicals in a stream onto old ceiling paint — speeds peeling
- paint over a mark — hides the problem and makes it harder to see what is happening
There are no “home recipes” against mould here — in a real bathroom they often do more harm than good.
When cleaning is not enough
- the mark returns in the same place week after week
- paint lifts or comes away when you wipe
- several halos on the ceiling or wall
- you painted before and it came back
- a persistent damp smell and a soft feel to the base
Then it is worth looking at surface work. Mould removal means treating the zone and restoring the base when needed — not a “forever” tip.
When to write on WhatsApp
After a calm look, if questions remain — we can review photos for free. Useful to send:
- a wide shot of the bathroom from the door — shower, window, extractor
- a close-up of the mark — no flash
- briefly: how you use the bathroom, window and extractor, mark after showers or in winter, painted before or not
For a joint — a photo along the silicone. For a ceiling — from below upward, not only a square crop.
You can write in English. We usually reply quickly; on a job it may take up to 2–3 hours.
What this page does not claim
We do not name mould species, do air testing or give medical opinions. Everyday marks in a bathroom are not a reason for panic. Breathing sensitivity belongs with a doctor.
We do not promise treatment will remove mould forever: bathrooms are demanding rooms, and how long a result lasts depends on how the room is used.
Related pages
Discuss your case — contact, in English. More about walls than bathrooms — mould on walls. If work is already clear — mould removal. Home — /en/.