Washing your bedding weekly at 60°C does more for dust mite allergen than anything you can do to the mattress itself. If you take one action from this article, make it that one.
House dust mite is one of the most common perennial indoor allergens, and Allergy UK notes that a significant amount of exposure happens in bed, which is why symptoms are often worse at night and on waking. Allergy UK estimates allergies affect around 20 million people in the UK, roughly a third of the population.
Mites feed on shed human skin and need ambient humidity to survive. They do not bite, and their presence is not a sign of an unclean home. Every home has them.
What works, in order of effectiveness
1. Wash bedding weekly at 60°C. Temperature matters: lower washes remove allergen but do not reliably kill mites. If a fabric cannot take 60°C, wash it cooler and tumble dry hot, or use a laundry additive designed for the purpose.
2. Use allergen-proof barrier covers on the mattress, duvet and pillows. These are tightly woven encasements, not ordinary protectors, and they physically separate you from the reservoir. Among the best supported single interventions.
3. Reduce humidity. Mites need ambient humidity and struggle below about 50%. Ventilate bedrooms daily, do not dry laundry in the bedroom, and use extractor fans properly elsewhere in the house. Underrated and free.
4. Vacuum the mattress with a HEPA-filtered machine, monthly. Without HEPA filtration you are largely redistributing allergen into the air you then breathe.
5. Air the bed. Throw the covers back for an hour after getting up rather than making it immediately. It lets overnight moisture evaporate rather than sitting in the mattress, which directly reduces the humidity mites depend on.
6. Remove carpet from bedrooms, if realistic. Hard flooring holds far less allergen reservoir and is easier to clean thoroughly.
7. Reduce fabric clutter in the bedroom: fewer cushions, fewer soft toys, washable curtains rather than heavy drapes.
What helps less than people think
Steam cleaning a mattress. It introduces moisture into something that then takes days to dry properly, and residual damp is worse than the problem it solves. Most mattress manufacturers advise against it.
Anti-mite sprays. Evidence is mixed at best, and they do nothing about the allergen already present, which is what actually causes symptoms.
Putting the mattress outside in the sun. Pleasant, and UV plus dryness has some surface effect, but it does not reach the interior where most mites live.
Freezing soft toys. Genuinely works for the toy, but toys are a minor reservoir compared with the bed itself.
Replacing the mattress annually. A new mattress becomes colonised within months. Barrier covers are the answer, not replacement.
Air purifiers alone. Dust mite allergen is relatively heavy and settles quickly rather than staying airborne, so purifiers help less with mites than with pet dander or pollen.
Cleaning a mattress properly
Do this two or three times a year.
- Strip it completely and wash everything, including the protector
- Vacuum the whole surface with an upholstery tool and HEPA filtration. Do the sides and the seams, where debris collects, and underneath
- Treat stains individually, with as little moisture as possible. Cold water for anything protein-based such as blood or sweat, because heat sets it. Blot, never rub, and never soak
- For odour, sprinkle bicarbonate of soda across the surface, leave several hours, then vacuum thoroughly. Cheap and genuinely effective
- Air it for a few hours with the window open before remaking
- Turn or rotate according to the manufacturer's guidance. Many modern mattresses are rotate-only rather than flip, and turning a one-sided mattress ruins it
Do not soak a mattress, and do not use a carpet extraction machine on one. Foam and fillings hold water for days, and a damp mattress interior grows mould that you cannot reach or remove.
Stains
Sweat and yellowing: a thin paste of bicarbonate of soda with a little hydrogen peroxide and a drop of washing-up liquid, applied sparingly, left to dry, then vacuumed. Test first, since peroxide lightens some fabrics.
Blood: cold water only, blotted. Heat sets it permanently.
Urine: enzymatic cleaner, applied sparingly but enough to reach the affected depth, then blotted and dried fast with a fan. This is the one case where getting the mattress slightly wetter is unavoidable, so dry aggressively afterwards.
General discolouration on an old mattress is usually permanent and largely cosmetic. A barrier cover solves the appearance and the allergen question at once.
Pillows and duvets
Frequently forgotten, and a significant allergen reservoir in their own right.
Most synthetic pillows and duvets can be machine washed at 60°C, though you need a large enough machine. Wash pillows two at a time to balance the drum, and dry thoroughly, with a couple of clean tennis balls in the dryer to redistribute the filling.
Feather and down usually need a specialist launderer, though some can be washed at home with care and very thorough drying. Incompletely dried down develops mildew and smells permanently.
Replace synthetic pillows every one to two years regardless, because they lose structure and accumulate a great deal that washing does not remove.
If someone in the house has asthma or allergic rhinitis
The bedroom is the highest-value room to focus on, because that is where the hours of exposure are.
- Barrier covers on mattress, duvet and pillows
- Bedding washed weekly at 60°C
- Humidity kept down through daily ventilation
- HEPA vacuum used weekly on the mattress and floor
- Hard flooring rather than carpet if possible
- Keep pets out of the bedroom, consistently the least popular and most effective advice
- Minimise soft toys, heavy curtains and fabric clutter, or wash them regularly
- Damp dust rather than dry dust, so allergen is captured rather than redistributed
Speak to a GP or pharmacist about symptoms as well. Environmental control helps and is worth doing, but it works alongside treatment rather than instead of it.
Frequency
| Task | How often |
|---|---|
| Wash bedding | Weekly, at 60°C |
| Air the bed | Daily |
| Vacuum mattress | Monthly |
| Wash mattress protector | Monthly |
| Full mattress clean | 2 to 3 times a year |
| Wash pillows and duvet | Every 3 to 6 months |
| Replace synthetic pillows | Every 1 to 2 years |
| Rotate mattress | Every 3 months |
| Replace mattress | 7 to 10 years, typically |
Frequently asked questions
Can I get a mattress professionally cleaned? Yes, typically £30 to £60. It usually involves HEPA vacuuming, a UV treatment in some services, and low-moisture spot treatment. Useful, but barrier covers and hot bedding washes do more.
Do mattress protectors stop dust mites? Ordinary protectors reduce moisture and stains. Allergen-proof barrier encasements are the ones that actually block mite allergen, and they are a different product.
How do I know if I have a dust mite allergy? Symptoms typically worse at night and on waking, year-round rather than seasonal. A GP or allergy clinic can test.
Is a memory foam mattress better for allergies? Foam is less hospitable than a sprung mattress with more internal space, but the bedding is where most exposure happens either way.
Does a dehumidifier help? In a damp bedroom, yes, by keeping humidity below the level mites need. It is a reasonable intervention where ventilation alone is not enough.
