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Bathroom

Permanently damp, and made of five materials with five different answers within arm's reach of each other.

A bathroom is defined by moisture that never fully leaves, and that single fact reorganises the advice. Mould is not a cleaning failure here but a humidity condition: the federal guidance's own bathroom note says that often-damp places are hard to keep free of mould, and that where it keeps reappearing in a shower, INCREASING VENTILATION and cleaning more frequently will usually prevent recurrence or keep it to a minimum. Cleaning without changing the ventilation buys weeks. The second feature is material density. A shower enclosure typically puts architectural glass, porcelain tile, cementitious grout, a plated tap finish, silicone sealant and acrylic within a metre of each other, and the acid that lifts limescale from the glass attacks the grout, while the abrasive that would clear the acrylic dulls it permanently. There is no single bathroom product for that reason. The third is a hardware rule that travels badly: the trade guidance for window and door hardware — dry duster, no water — applies to plated and coated fittings generally, and a tap finish soaked in an acidic descaler is the commonest way a bathroom is damaged by cleaning it.

What this setting actually gets

  • Mould — A living growth, not a stain. Killing it and removing the staining are two separate jobs, and neither addresses the moisture that caused it.
  • Limescale — A hard, chalky calcium carbonate deposit left by hard water. Dissolved by acids, essentially untouched by detergents.

What suits it here

Recorded as appropriate to this setting rather than cleared on a material. Suitability in a place and safety on a surface are separate questions, and both have to pass before anything is recommended.

  • Mould remover

    Usually a bleach in a thickened spray. It removes the stain reliably and does nothing at all about the reason the mould is there.

  • Moisture control

    The treatment for mould that is not a cleaning product. Every authority in this register puts it first, and it is the only one that stops the problem recurring.

  • Descaling

    Dissolving mineral deposits with an acid. Effective, well understood, and the wrong answer on any surface made of the same mineral.

What to keep out of it

  • Sodium hypochlorite (chlorine bleach) — THREE REGULATORS, THREE POSITIONS. UK guidance prefers proprietary mould and mildew products over bleach on health and safety grounds; US federal guidance does not recommend biocides as routine practice and never mentions bleach; a US state health department permits it as an optional step AFTER physical removal. This edge records the UK position for the context it governs, and the catalogue publishes the disagreement rather than averaging it.
  • Mild abrasion — Within a metre of each other a shower typically has glass, porcelain tile, cementitious grout, a plated tap finish, silicone sealant and acrylic. The abrasive that clears one of those dulls another permanently, which is why there is no single bathroom product.

Precautions this setting adds

  • Mould remover

    • Ventilate the area
    • Wear gloves
    • Wear eye protection

    Windows open during and after, and doors shut so spores are not carried to other rooms. Mask, gloves and goggles, washed or safely discarded afterwards.

Why this setting is different

  • Moisture control and recurrence — Three separate health authorities lead with the same instruction, and it is not a cleaning instruction: fix the water. Clean without fixing it and the mould comes back, and the cleaning was never the failure.

A context page states what changes in a setting. What is safe on a given surface is answered on the material, and what to do about a given problem is answered on the stain — because both of those travel between settings and the answers on this page do not.