The bathroom is the most humid and chemically active space in any apartment. Daily hot showers, weak ventilation, Tashkent's hard water, and temperature swings between night and morning — in these conditions mold and limescale are inevitable. Owners often fight the same stains for years: scrub with acid, bleach with chlorine, two weeks later it's back. The problem isn't the products, it's the approach: fight the cause, not the black dots. The 166 Cleaning team services dozens of Tashkent bathrooms every month and knows exactly why the problem keeps returning. Here's the detailed breakdown: why mold grows, where limescale comes from, how to remove both, how to care for grout, chrome and silicone — and when to call a crew instead of fighting alone.
1. Why mold grows in the bathroom
Mold is a living fungus that needs three things: moisture, warmth, and organic food. A typical Tashkent bathroom supplies all three. Showers push humidity to 90–95%, temperature stays at 22–26 °C, and soap film on the walls feeds the spores. If water doesn't evaporate fast, spores germinate in 24–48 hours.
The key factor is ventilation. In most Tashkent flats the exhaust is either clogged from years of use or simply doesn't pull. Test it now: hold a sheet of paper to the vent. If it doesn't stick, there's no airflow — mold is guaranteed. Clearing the channel is cheap, takes an hour and solves 70% of fungus problems.
The second common cause is microcracks in the grout or silicone. Water slips behind the tile, doesn't dry for weeks, and mold grows on the back side invisibly. Visible black in the seams is just the tip of the iceberg.
Foreman's rule: if mold returns to the same spot after three treatments, the problem isn't cleaning — it's construction. Look for a leak, an air pocket, or a dead exhaust fan.
2. Prevention beats cure
- Air for 20–30 minutes after each shower. Door open, fan on.
- Squeegee water off the tiles. 30 seconds of work.
- Don't dry wet laundry in the bathroom. One big wet item raises humidity 40% overnight.
- Weekly antifungal spray. Cheaper and more effective than bleach.
If there's no window and the fan is weak, buy a small dehumidifier or a wall fan with a timer that runs 40 minutes after each shower. Cheaper than annual re-grouting.
3. Removing existing mold
Main rule: mechanical scrub first, disinfect second. Pouring bleach on black spots bleaches them but leaves the mycelium alive.
- Respirator and gloves. Spores are a lung hazard.
- Dry stiff brush or old toothbrush on the seams and silicone.
- Apply 9% vinegar, leave 30 minutes.
- Rinse, wipe dry.
- For heavy growth — chlorine product (with windows open!).
- Next day — baking soda paste, scrub, rinse, dry.
Never mix vinegar and bleach — releases chlorine gas. More on dangerous combinations: incompatible cleaners.
When mold has penetrated the grout or silicone itself, surface cleaning fails. Only replacement helps.
4. Where limescale comes from
White streaks on fixtures and shower glass are calcium and magnesium salts that precipitate as water evaporates. Tashkent water hardness is high: 5–9 mg-eq/L in different districts against a norm of 3–4. Every dried drop leaves a microscopic layer. Layers stack up into a crust in weeks.
- Creates a haze on chrome that later gets scratched by dust — chrome can't be restored.
- Clogs shower head nozzles — pressure drops.
- Coats water heater elements, cutting their lifespan by 50%.
- Forms stone layers inside the toilet.
5. How to remove limescale
9% vinegar
Cotton pad soaked in vinegar, pressed against the fixture, wrapped in plastic for a compress. Remove after 1–2 hours, scrub with a soft brush.
Citric acid
2–3 sachets per cup of hot water in a spray bottle. 15–20 minutes contact time. Milder than vinegar, no smell.
Specialised descalers
Plenty in Tashkent shops. Look for "safe on chrome and nickel" labels. Never on natural stone or marble — acid eats the polish.
What not to do
- No metal scouring pads — they strip chrome.
- No harsh abrasive on shower glass — micro-scratches trap limescale faster.
- No mixing acid with bleach.
6. Grout between tiles
- Scrub dry with a stiff brush.
- Vinegar or citric acid solution for 30 minutes.
- Rinse and dry.
- Grout whitening paste or diluted bleach, careful with the tile.
- Rinse, dry, apply grout sealer — keeps it clean 6–12 months.
If grout crumbles under pressure, it needs replacing, not cleaning.
7. Chrome and fixtures
- Dry microfiber wipe after every use — 5 seconds.
- Weekly 30-minute vinegar compress.
- Chrome polish or a drop of olive oil for finish — creates a water-repellent film.
- Never use metal sponges, abrasive powders, or stiff brushes.
8. Silicone seals
Silicone around tubs, sinks, and showers is a consumable. Manufacturers claim "10 years" — Tashkent reality is 2–3. After that it blackens, cracks, peels. Water slipping behind the tub means mold in the neighbour below.
- Weekly neutral-pH antifungal spray.
- Don't pour aggressive acid on silicone — it softens.
- Black spots — remove immediately with a soft brush and vinegar before spores go deep.
Once mold is inside the silicone, only replacement helps. Removing old silicone takes 20 minutes, laying new takes 30, drying a full day. Result — like a new bathroom.
9. When to call pros
- Black mold along the full length of seams and silicone.
- Shower-glass limescale thicker than 1 mm.
- Toilet with a rust-coloured stone layer.
- Grout that crumbles under pressure.
- Damp smell that won't air out.
- Post-renovation cement and plaster residue.
In these cases call a deep cleaning crew. Pros have industrial concentrates, steam generators, and experience with delicate finishes — we don't scratch chrome or eat marble. For localised issues try hourly cleaning: a technician spends 2–3 hours fixing a single zone.
FAQ
Does bleach kill mold forever?
No. It decolourises visible fungus, but mycelium stays in the pores. It returns in 1–4 weeks. Fix the cause — humidity and ventilation.
Can I scrub tiles with a metal brush?
No. Glaze scratches trap dirt and the tile looks worse in six months. Use a medium-stiff plastic brush.
How do I remove yellow film on an acrylic tub?
Only mild products: baking soda, citric acid, acrylic-safe sprays. No abrasives or solvents.
Should I replace a clogged shower head?
Soak it in vinegar overnight first. If nozzles clear, keep it. Otherwise replace.
Why are there yellow spots on my bathroom ceiling?
Either condensation (fix ventilation) or a leak from upstairs. Growing spots — check the roof or upstairs neighbour.
Bathrooms are small spaces with big responsibility — water, heat and chemistry meet here, and mistakes get expensive. Ten minutes of weekly prevention beats a full-day deep clean later. If you feel you've missed the moment, don't try to hero it. Call 1331. The 166 Cleaning crew arrives within 60 minutes anywhere in Tashkent, brings pro equipment, and restores that original-installation shine. The call is free from any Uzbekistan operator, consultation too.