Identify joints and choose appropriate care
Identify cement grout or silicone seals, clean gently and dry. Recurring dark marks, cracks or loose joints need an assessment.
Most bathrooms have two kinds of joints. Cement grout fills the gaps between tiles on walls and floors. It is mineral, slightly porous and absorbs moisture and dirt. Silicone joints sit in corners, along the bathtub, around the shower tray and next to the sink. They are flexible and seal transitions where building parts move slightly.
The difference matters because each material reacts differently. Something that is harmless on cement grout can attack silicone, and the other way round. Before cleaning, check which joint you are dealing with and read the instructions on the cleaning product. If you are unsure, test it first on a small, hidden spot.
| Situation | Appropriate action |
|---|---|
| Rigid joint between tiles | Often cement grout; clean gently with a soft brush, do not try acids. |
| Flexible joint at edges | Often silicone; wipe gently and dry, do not scrape or pull. |
| Cracks, separation or recurring marks | Record what you see and contact management or a specialist; do not cover it up. |
Gentle routine cleaning
For regular care, warm water with a little mild all-purpose or bathroom cleaner is usually enough. Apply it with a soft cloth or brush, let it sit briefly and brush along the joint rather than across it. Then wipe thoroughly with clean water so that no residue stays in the pores.
Wire brushes, scouring powder and pointed tools are a bad idea. They roughen the surface, wear away grout and create exactly the small hollows where new dirt settles.
- Use a soft grout brush or an old soft toothbrush
- Use one product at a time and never mix products
- Rinse with clean water
- Rub the joints dry afterwards
Treating silicone with care
Silicone is soft and can tear when scrubbed hard or exposed to unsuitable products. Wipe silicone joints with a damp microfibre cloth and a little mild cleaner. Do not scrape them with knives or blades, even if a film is stubborn. A damaged silicone joint no longer seals reliably.
Pay special attention to the manufacturer's information on the cleaner. Some products are explicitly suitable for silicone, others are not. If the joint is coming away from the surface, shows cracks or feels hard and brittle, cleaning will not help. Replacement by a professional is the right step then.
Discoloration or mould: look closely
Not every dark joint is mouldy. Often it is soap residue, skin oils or dust stuck in the surface. Such discoloration can frequently be lightened considerably with the routine cleaning described above. Cement grout can also simply darken over the years without any hygiene problem.
It is different when dark spots keep coming back despite cleaning, sit deep in the material, spread, or come with a musty smell. That can point to moisture behind the tiles or at the waterproofing. As a tenant, report it to the property management and have a professional find the cause instead of only cleaning the surface.
Further reading
Preventing moisture
Good grout care starts right after showering. Squeegee the walls and glass and quickly wipe the joints in the shower area dry. Then ventilate well, ideally with the window wide open or the fan running. This way less water remains in the joints.
Hang wet cloths and towels up to dry instead of leaving them in a pile. Do not keep shampoo bottles permanently in the shower corners, because the area underneath stays damp for a long time. These small habits take little time and protect the material in the long run.
- Squeegee water after showering
- Air the room well every day
- Store bottles on a shelf, not in the corner
- Wipe weekly with a mild cleaner
Further reading
When a professional is the better choice
Cleaning has its limits. Crumbling cement grout, hollow-sounding tiles, loose silicone joints or water running behind the panelling are no longer cleaning issues. They need tradespeople or the property management, because water damage can otherwise grow unnoticed.
For the ongoing care of your apartment in the supported municipalities around Zurich and Rapperswil-Jona, you can book regular apartment cleaning with PUTZIO for CHF 40 per hour. The cleaner looks after the bathroom and joints gently as part of normal cleaning. Repairs, regrouting or mould remediation are not part of this service.