Quick Answer: Washing bedding at 60C (140F) kills dust mites, while cooler washes remove allergen but leave live mites behind. Weekly washing of sheets and pillowcases, drying outdoors only outside pollen season, and skipping fabric softener on bedding together do more for indoor allergy symptoms than most air purifiers, because the bulk of allergen exposure happens during the eight hours your face is pressed into fabric.

Most allergy advice points at the air. The largest single exposure most people have is textile, and it happens while asleep.

This is general information, not medical advice. Persistent or worsening symptoms warrant a conversation with a clinician about testing and treatment.

Change 1: Wash bedding at 60C, weekly

Temperature is the variable that decides whether you’re removing allergen or removing mites.

Cool and warm washes (30-40C / 86-104F) wash away a good portion of the allergen already present - which helps - but a meaningful proportion of live dust mites survive and repopulate within days.

60C / 140F kills dust mites reliably. This is the temperature to use for sheets, pillowcases, and duvet covers.

Weekly is the interval that matters. Mite populations and allergen accumulation rebuild over roughly one to two weeks, so fortnightly washing means you spend half your nights on a bed at peak allergen load.

If you can’t wash hot - because of delicate bedding, energy cost, or a machine without the setting - two workarounds help:

• A 20-minute tumble dry on high heat after a cool wash kills mites, even if the garment was washed cold
• Freezing small items like a pillow cover for 24 hours kills mites, though it doesn’t remove the allergen, so it must be followed by a wash

Priority order if you’re only changing one thing: pillowcases first. Your face is on them for the entire night.

Change 2: Stop drying laundry indoors during heating season

Indoor drying is one of the largest sources of household humidity, and humidity is what dust mites need to survive.

Drying a single load indoors releases a substantial amount of water into the air. In a closed home with the heating on, that pushes indoor humidity up - and dust mites thrive above roughly 50% relative humidity and struggle below 45%. Damp indoor air also encourages mould, which is a separate and common allergen.

What to do instead:

• Dry outdoors when pollen counts are low - early morning and after rain are the best windows
• If drying indoors is unavoidable, do it in one room with the door closed and a window cracked, or with a dehumidifier running
• Never dry laundry on radiators in a bedroom, which combines the two worst factors: moisture and warmth in the room you sleep in

The measurement worth making: a cheap hygrometer costs very little and tells you whether you have a humidity problem at all. Aim for 40-50%. Above 55% consistently, a dehumidifier is likely the highest-value purchase you can make for indoor allergies - ahead of an air purifier.

The pollen caveat: during peak season, outdoor drying brings pollen indoors on the fabric. In those weeks, indoor drying with a dehumidifier is the better trade.

Change 3: Skip fabric softener on bedding and towels

Fabric softener works by coating fibres with a thin film. On bedding, that film has two downsides for allergy sufferers.

It reduces absorbency, which means sheets hold moisture at the surface rather than wicking it away - and surface moisture is exactly what supports mite populations.

The fragrance itself is a common irritant. Scented laundry products are a frequent trigger for people who describe non-seasonal nasal symptoms and can’t identify a cause. If your symptoms are worse in bed and you can’t work out why, unscented is a two-week experiment worth running.

What to use instead:

• Wool dryer balls soften mechanically with no coating and no fragrance
• Half a cup of white vinegar in the rinse softens and strips detergent residue - the smell doesn’t survive drying
• Less detergent. Stiff, scratchy laundry is very often detergent residue rather than a lack of softener, and using less fixes it

A related change: switch to a fragrance-free detergent for bedding specifically. You don’t have to change the whole household’s laundry - just the load your face spends eight hours on.

Change 4: Wash the things you never wash

Sheets get attention. The items holding the most allergen usually don’t.

The overlooked list, with intervals:

• Pillows themselves (not just cases) - every 3-6 months; most synthetic pillows are machine washable, and they hold far more allergen than the case does
• Duvet and comforter - every 3-6 months, hot if the care label allows
• Mattress protector - monthly, at 60C
• Curtains in the bedroom - every 3-6 months; they collect both dust and outdoor pollen at the exact point air enters the room
• Cushion covers and throws on the sofa where you sit daily - monthly
• The pet’s bed - weekly at 60C if pets are in the home at all, and this is the single most under-washed item in most households

A replacement note on pillows: pillows accumulate allergen permanently, and even correct washing doesn’t fully reverse it. Most guidance suggests replacing pillows every 1-2 years, and it’s a bigger intervention than most people expect.

The barrier upgrade: allergen-proof encasings for mattress and pillows are one of the few allergy products with reasonable supporting evidence. They work by physically separating you from the reservoir - and they only need washing quarterly.

Change 5: Move laundry out of the bedroom entirely

This one costs nothing and gets skipped by almost everyone.

A laundry basket in the bedroom holds worn clothes carrying pollen, pet dander, and skin cells directly in the room where you spend eight uninterrupted hours breathing. Clean laundry folded and left on a bedroom chair collects settling dust before it’s worn.

Four small relocations:

• The laundry basket moves outside the bedroom
• Worn outdoor clothes - especially during pollen season - come off before entering the bedroom, not in it
• Clean laundry goes into closed drawers rather than open stacks on furniture
• Shoes stay by the door; they carry pollen indoors more than anything else you own

The pollen-season addition: shower and wash your hair before bed rather than in the morning. Hair holds a surprising amount of pollen, and going to bed with it puts a full day’s collection directly onto the pillow you just washed. This one change is frequently reported as the most noticeable single improvement during ragweed season.

As autumn arrives and windows close, the balance shifts from outdoor pollen toward indoor mite and mould allergens - which is exactly when the laundry changes on this list start to matter more than the pollen ones.

FAQ: Laundry and Allergen Questions, Answered

Does a hot wash damage bedding?

Good cotton bedding is designed for 60C and will last years. Delicate or blended bedding may not be - in which case use a cool wash followed by 20 minutes on high in the dryer, which achieves the same mite kill.

Is an air purifier a waste of money then?

No - a HEPA purifier genuinely helps with airborne pollen and pet dander, particularly in a bedroom. It just does very little for dust mite allergen, which is heavy and sits in fabric rather than staying airborne. Do the laundry changes first, then add a purifier if symptoms persist.

How quickly should I notice a difference?

Give it three to four weeks. Allergen reservoirs take time to deplete, and symptoms lag behind exposure. Changing everything at once and judging after five days is how people conclude none of it works.

Do I need special anti-allergy detergent?

No. Fragrance-free and used in the correct amount is what matters. Products marketed specifically as anti-allergy detergents don’t have strong evidence beyond that.

TL;DR:

• Wash bedding weekly at 60C - cooler washes remove allergen but leave live mites
• Stop indoor drying during heating season; keep indoor humidity at 40-50%
• Skip fabric softener on bedding; use vinegar or wool dryer balls instead
• Wash the forgotten items: pillows, duvet, mattress protector, curtains, pet bed
• Move the laundry basket out of the bedroom and shower before bed in pollen season

The biggest allergen exposure most people have is the eight hours their face spends in fabric. Four of these five changes cost nothing, and together they outperform most of what’s sold in the allergy aisle.