Bleach vs eco-friendly mould removal
Published by Eco Mould Removal
Short answer: Bleach kills mould on hard, non-porous surfaces such as tiles and glass. On porous surfaces such as plaster and timber it mostly removes the colour, and the growth below the surface can return. Bleach-free treatments avoid chlorine fumes and are better suited to walls and ceilings.
Bleach is the first thing most people reach for. It is cheap, it is under the sink and the black marks vanish in minutes. Whether it has solved anything depends on what the mould was growing on.
What bleach does well
On hard, non-porous surfaces such as glazed tiles, glass, baths and sealed worktops, household bleach kills surface mould and removes the stain. For shower tiles it is a reasonable choice, used with the window open.
Where bleach falls short
Walls and ceilings are porous. Mould grows thread-like roots into plaster, paper and timber.
- It stays on the surface. The chlorine in bleach does not travel far into porous material, so growth below the surface can survive.
- It adds water. Household bleach is mostly water, and that water soaks into the wall you are trying to dry.
- It hides the evidence. Bleach removes the colour, so the wall looks clean while the mould recovers.
- It can damage finishes. Bleach can discolour paint, fabrics and timber.
The fumes
Chlorine bleach gives off fumes that irritate the eyes, nose and airways, and it must never be mixed with other cleaners. That matters most in exactly the homes that worry about mould: those with babies, pets, asthma or allergies.
How bleach-free treatments compare
| Chlorine bleach | Bleach-free treatment | |
|---|---|---|
| Tiles and glass | Works | Works |
| Plaster, paint and timber | Mostly removes colour | Formulated to work into the surface |
| Fumes | Strong, irritating | Low odour |
| Around children and pets | Keep them out until fully aired | Room usable once surfaces are dry |
| Effect on finishes | Can bleach paint and fabric | Gentler on surfaces |
| Environment | Chlorine compounds go down the drain | Biodegradable ingredients |
“Eco-friendly” on its own is a loose label. Ask any company which product they use and for its safety data sheet. A serious company will send it.
What matters more than the product
No product, bleach or otherwise, keeps mould away if the wall stays damp. The treatment is half of the job. The other half is finding and fixing the moisture, which we cover in why mould keeps coming back.
What we do
We remove mould with bleach-free, biodegradable treatments, capture spores with HEPA filtration and then deal with the cause, usually through better ventilation. It starts with a free survey: mould removal in Dublin.
Have the cause found, free
Our survey is free and ends with a written report and a fixed quote. Read about our mould removal in Dublin or book a visit.