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.
Precautions
- Never mix with other cleaning products
- Ventilate the area
- Wear gloves
- Wear eye protection
- Keep away from children and pets
- Limit the contact time
- Rinse thoroughly afterwards
In detail
Most products sold as mould removers are sodium hypochlorite thickened so it clings to a vertical surface, sometimes with a surfactant and sometimes in a foaming carrier. They work: hypochlorite oxidises the pigment in the growth and the black marking disappears, often within minutes. The problem is what that success conceals. The US environmental regulator's guidance on mould is unusually direct about the priority order — the moisture problem must be fixed, or the growth returns, and killing what is present is not the same as removing the conditions that grew it. On a porous surface the visible staining is only the surface expression of hyphae that have penetrated, so bleaching the face of it leaves the organism and removes the evidence. Two material cautions travel with the product class. Hypochlorite bleaches dyes indiscriminately, so overspray onto a bath mat, a towel or a coloured grout leaves permanent pale marks. And a bleach-based product in a bathroom is the single most common setting for a mixing accident, because a descaler or a toilet cleaner has very often been used on the same surface within the hour.
Properties
- pH
- Strongly alkaline
What works
Mould remover is effective against Mould Supported
It removes the stain reliably and does nothing about the reason the growth is there.
Mould remover requires the precaution Household plastics
Safe only in specific conditions
This is only appropriate within specific limits, and nothing is established outside them.
Only within these limits:
- For MOULD. This is not a general-purpose cleaner and is not routine care
- Hard surfaces only — absorbent materials are discarded rather than treated
- 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
- Small areas only; larger areas of mould go to qualified professionals
The doors-shut half of the ventilation instruction is rarely stated anywhere, and it is the one most people get backwards.
Precautions
- Ventilate the area
- Wear gloves
- Wear eye protection
Evidence
Supported
Sources
UK Health Security Agency and Department for Levelling Up, Housing and Communities, GOV.UK, 2023 · Government or regulator
Relied on for: That an appropriate cleaning product is used on hard surfaces and left to dry completely, that windows should be open during and after clean-up and doors shut to prevent spores spreading, that a mask, gloves and goggles are worn, and that larger areas should only be addressed by qualified professionals. (states this directly)
Why
- Mould remover is explained by Oxidation and bleaching
- Mould remover is explained by Moisture control and recurrence
Hacks and claims involving this
- Killing the mould solves the problem Does not work
Sources for this page
Sources
United States Environmental Protection Agency (EPA) · Government or regulator
Relied on for: That the moisture problem must be corrected or mould growth returns, and that removing growth without addressing moisture is not a solution. (states this directly)
Right to Know Hazardous Substance Fact Sheet: Sodium Hypochlorite
New Jersey Department of Health · Government or regulator
Relied on for: That sodium hypochlorite is a corrosive oxidising agent. (inferred from the source; not stated directly)