Case Study: Bleach-Free Mould Remediation at a Sydney Aged Care Facility

How a large commercial cleaning company used MOULDZAP to remediate heavy mould contamination at a Sydney aged care facility — without bleach, chlorine or corrosive chemicals.

The challenge: a mould-affected facility that had to be safe for capital works

After a long period of inactivity, an aged care facility in Carlingford, Sydney developed visible mould contamination across interior window sills, walls, ceilings, furniture and carpet. Condensation and limited ventilation had allowed black fungal staining to spread along aluminium frames and painted surfaces.

The commercial cleaning team engaged for the job had a clear brief: prepare the venue for upcoming capital works, and leave it safe and hygienic — free from both surface and airborne mould contamination.

The harder constraint was how. In an aged care environment, the usual answer — chlorine bleach and corrosive biocides — creates its own problems: harsh fumes, respiratory irritation for cleaning staff, damage to surfaces, and residues that compromise indoor air quality. The team wanted a science-led alternative that aligned with green-cleaning standards and could demonstrate measurable performance.

Why bleach wasn't the answer

Bleach is good at one thing: stripping the colour out of mould staining. What it's far less good at is dealing with the mould itself. Its active ingredient struggles to penetrate porous materials, which means spores and root structures embedded in paint, grout and timber often survive — and regrowth follows within weeks. In occupied or sensitive environments like aged care, the fumes and corrosive residue are a further liability.

The solution: clean chemistry, not harsh chemicals

MOULDZAP is Thrive's chlorine-free mould remediation product, built on Clean Chemistry: peracetic acid (PAA) in a viscous formulation that clings to vertical surfaces, extending contact time and penetrating porous materials, spores and the root structures that sustain regrowth. It delivers commercial-grade performance without bleach, chlorine or harsh fumes — and the formulation is fully biodegradable.

The remediation team applied it in three steps:

1. Targeted application — MOULDZAP misted evenly over affected areas for full coverage, including vertical and overhead surfaces.
2. Dwell time — left for 15 minutes, allowing the clinging formula to penetrate staining, spores and root structures.
3. Wipe clean — residue removed, leaving visibly clean, hygienic surfaces.

Because the treatment reaches below the surface rather than just bleaching the stain, results hold for longer — the spores that would normally seed regrowth are dealt with in the same pass.

The results

Before: heavy mould staining across window sills and frames.

After: complete removal of visible mould, with restored clean surfaces and long-lasting cleanliness.

The visual and hygiene improvements were immediate and sustained — and the site was cleared for capital works without exposing the team or future occupants to harsh chemical residues.

"Mould remediation is always tough — the mould itself is hazardous, and most chemical products are just as harsh on our team. MOULDZAP changed that. It achieved outstanding results without compromising the health of our staff or the safety of the site."

— Regional Key Account Manager, commercial cleaning company

The bigger picture: safer for people, better for the planet

• No harsh chemicals — safe for people, pets and surfaces when used as directed.
• Bleach-free and chlorine-free — no harsh fumes, better indoor air quality, safer for cleaning staff.
• Lasting results — penetrating action deals with the spores that sustain regrowth, reducing maintenance cycles.
• Biodegradable formulation — commercial-grade performance with a sustainable footprint.

This case demonstrates that professional-grade mould remediation doesn't require the environmental or health drawbacks of chemical biocides. Different cleaning problems require different science: organic waste is best solved with biology, while scale, mould and mineral build-up are best solved with advanced clean chemistry. Thrive combines both approaches across its range.

Dealing with mould at home?

The same science the professionals use is available for your home. Shop MOULDZAP, or read our guides on choosing a mould remover and why bleach doesn't kill mould.

Facilities manager or commercial cleaner? Talk to us about commercial supply via our wholesale site.