Why You Should Deep-Clean Your Mattress: Dust Mites, Mould Spores & Allergies

You spend roughly a third of your life on your mattress. In that time, you shed nearly a gram of skin every night, produce about half a litre of sweat, and breathe out moisture that soaks into the fabric, foam, and fibres underneath you.

All of that creates a thriving ecosystem you can't see — one that affects your sleep quality, allergies, and respiratory health.

What's living in your mattress

Dust mites

The average mattress hosts between 100,000 and 10 million dust mites. They feed on dead skin cells and thrive in the warm, humid environment your body creates while you sleep.

Dust mites themselves aren't the problem — their droppings are. Each mite produces around 20 faecal pellets per day, and these pellets contain proteins that are one of the most common triggers for indoor allergies and asthma. A mattress that's been in use for two years can contain up to 10% of its weight in dead mites and their droppings.

Mould spores

Mattresses absorb moisture from sweat and breath every night. In humid climates this moisture doesn't always evaporate fully during the day. Over time, the moisture content inside the mattress rises, creating conditions where mould spores germinate and grow.

Mould inside a mattress is invisible until it's well established. By the time you see dark spots or smell a musty odour, the colony has been growing for weeks.

Bacteria

Sweat, body oils, and dead skin create a rich food source for bacteria. Used mattresses harbour a diverse bacterial population, including species that can cause skin infections — particularly if you have broken skin, eczema, or surgical wounds.

Allergens

Beyond mites and mould, mattresses accumulate pet dander (if pets access the bedroom), pollen tracked in on clothing and hair, and general household dust. These allergens settle deep into the mattress filling where vacuuming can't reach.

The health impact

If you wake up congested, sneezy, or with itchy eyes most mornings — but feel better after an hour or two — your mattress is the likely culprit. These are classic signs of dust mite allergy:

• Morning congestion and runny nose
• Sneezing fits when you get into bed or first wake up
• Itchy, watery eyes in the morning
• Skin irritation or eczema flare-ups on areas that contact the mattress
• Worsening asthma symptoms at night or early morning
• Poor sleep quality — restlessness, frequent waking, feeling unrefreshed

For children, the impact can be more pronounced. Childhood asthma is strongly associated with dust mite exposure, and the bedroom is where exposure is highest.

Why regular cleaning isn't enough

Changing sheets weekly, using a mattress protector, and vacuuming the surface are all good practices — but they only address the top layer. The allergens, mites, and mould that cause health issues live deep inside the mattress where these methods can't reach.

Vacuuming removes surface dust and some mites from the top few millimetres, but a standard household vacuum can't generate enough suction to extract material from deep inside foam or spring layers.

Mattress protectors prevent new moisture and skin cells from reaching the mattress surface, but they don't address contamination that's already inside. And most protectors aren't truly waterproof — moisture vapour still passes through.

Sunlight is often recommended for mattress freshening. While UV light does kill surface bacteria and mites, sunlight can't penetrate more than a few millimetres into the mattress fabric.

Why steam isn't the answer either

A common assumption is that steam cleaning is the gold standard for mattress sanitisation. The reasoning sounds right — heat kills mites and bacteria. The problem is what steam leaves behind: water.

Mattresses are absorbent. Any moisture that doesn't fully evaporate sinks into the foam and fibres, and that residual damp becomes new food for the very mould you were trying to kill. Hot, wet, then slowly drying is precisely the cycle mould thrives in.

The better approach is dry — no water, no steam, no soaking.

Professional mattress cleaning: what actually works

Our mattress cleaning service uses the MattressKleen process, a four-stage dry method:

1. Pulsate

Portable equipment vibrates the mattress to dislodge embedded dust mites, dead skin, and debris from deep within the layers. Without this first step, vacuuming alone only lifts the top few millimetres.

2. Vacuum extract

A powerful sealed vacuum draws the dislodged material — dust mites, dead skin, excrement, fine debris — out of the mattress through HEPA filtration. HEPA captures particles down to 0.3 microns, including mite droppings and mould spores that a household vacuum would simply blow back into the air.

3. UVC sanitisation

UVC lamps pass over the mattress surface, killing bacteria, viruses, and mould spores on contact. UVC works by destroying the DNA of microorganisms — no chemicals required.

4. Anti-bacterial deodorising spray

The final stage is a non-toxic anti-bacterial spray that finishes the sanitisation, deodorises the mattress, and leaves no chemical residue. The whole process is dry — your mattress is ready to sleep on the same day, no airing out required.

How often should you clean your mattress?

Every 6–12 months for most households. More frequently if:

• Anyone in the home has dust mite allergies or asthma
• You live in a humid coastal climate
• Pets sleep on or near the bed
• The mattress is more than 3 years old
• You notice musty odours or visible staining

For allergy sufferers, a professional clean at the start of spring and autumn — coinciding with seasonal allergy peaks — can make a noticeable difference to symptom severity.

Hospitality settings (hotels, short-stay rentals, schools, boarding houses) typically benefit from a yearly cadence at minimum, with hotels often cleaning between guest cycles for premium rooms.

Between professional cleans

Extend the results of professional cleaning with these habits:

• Wash bedding weekly in hot water (at least 60°C) to kill dust mites in sheets and pillowcases
• Use a quality mattress protector — waterproof and breathable, washed monthly
• Vacuum the mattress surface monthly using the upholstery attachment
• Air the mattress — pull back the covers for an hour each morning to let moisture evaporate
• Keep bedroom humidity below 60% — use a dehumidifier in humid climates
• Don't make the bed immediately — let it air for 20–30 minutes after waking

Book a mattress clean

Our mattress cleaning service covers single, double, queen, and king mattresses, with combination discounts for multiple mattresses in one visit. We also work on pillows, rugs, and sofas, and treat urine and body fluid stains on request.

Contact us for a free assessment within our service area. We'll have your mattress sanitised and ready to sleep on the same day.

Your mattress works hard for you every night. Return the favour once or twice a year.