Short answer: once a week for the sheets and pillowcases you sleep on every night. Every two weeks is the outer limit for most people, and six situations pull it down to twice a week or more.
The part that gets missed is everything else on the bed. Pillowcases, pillows, protectors, duvets and the mattress itself all have their own schedule, and most of them get washed far less often than they should.
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The full bedding schedule
| Item | How often | Notes |
|---|---|---|
| Fitted and flat sheet | Weekly | Every two weeks is the outer limit |
| Pillowcases | Weekly, or twice weekly | They take the most contact with skin and hair, so they are the first to justify a shorter cycle |
| Mattress protector | Every 1 to 2 months | Check the label. Many waterproof ones lose the membrane in a hot wash or a dryer |
| Pillows themselves | Every 3 to 6 months | Most polyester and down pillows are washable. Memory foam and latex are not, and are spot cleaned |
| Duvet or comforter | Every 3 to 6 months | Or annually if it lives inside a cover you wash weekly |
| Duvet cover | Weekly to fortnightly | Treat it as a sheet, because that is what it is doing |
| Blankets and throws | Every 1 to 2 months | More often if a pet uses them |
| Mattress | Vacuum every 3 months | It cannot be washed. The method is in how to clean a memory foam mattress |
Six situations that shorten the interval
- You sweat at night. Moisture is what everything else feeds on. If the bed is the cause rather than you, the diagnosis is in the cooling mattress guide.
- A pet sleeps on the bed. Twice a week, and a washable cover over the duvet saves the duvet.
- Allergies or asthma. Dust mites live on shed skin and their waste is the allergen. A weekly hot wash is the standard advice, and it is the temperature that does the work rather than the frequency.
- You go to bed without showering, or you use lotions and oils at night. Pillowcases twice a week in that case.
- Someone is ill. Change after the illness, and wash hot.
- You sleep with no top sheet. The duvet cover is now taking the contact the sheet used to, so it moves onto the weekly schedule.
Temperature is what matters
Warm water gets sheets clean. Killing dust mites takes a hot wash, and the figure quoted in allergy guidance is around 130 degrees Fahrenheit, which is above the default setting on many domestic machines. If mites are the reason you are washing, check what temperature your hot cycle reaches.
Two constraints on that. Cotton percale takes hot washing well and softens with it, which is one of its advantages, as we set out in what thread count is best for sheets. Waterproof protectors usually do not: the laminate that makes them waterproof degrades in a hot wash and in a hot dryer, so those go warm and low.
If you cannot wash hot, a hot tumble dry does much of the same job. Twenty minutes on high heat is enough to deal with mites even if the wash itself was warm.
What builds up between washes
In a week, a sleeper sheds skin cells, gives off around a pint of moisture a night, and transfers body oils, hair product and whatever was on their skin. That combination is what dust mites feed on, and it is why the pillowcase goes first: it takes the face for eight hours.
Two practical effects beyond hygiene. Body oils break down elastic, so fitted sheets that sit for weeks lose their corners sooner. And a mattress left under an unwashed protector holds moisture, which is the same airflow problem we describe in what is a platform bed, where a solid deck traps what a slatted one lets out.
Making the schedule easier to keep
- Own two sets. The single change that makes weekly washing realistic, because the bed gets remade immediately.
- Use a protector. It takes the moisture and washes easily, which extends the mattress underneath. A waterproof protector is the version for spills and allergies, and a quilted fitted pad is the breathable alternative when waterproofing is not the point. The difference is in mattress pad vs topper.
- Pick sheets that wash well. Percale gets softer with every wash, which is the opposite of sateen. The Ruvanti cotton percale set is the straightforward version.
- Wash the duvet cover with the sheets, not on its own schedule. It is doing the same job.
Common questions
How often should you wash your sheets? Once a week for a bed slept in nightly. Every two weeks is the outer limit, and pets, allergies, night sweats or sleeping without a top sheet pull it shorter.
How often should you wash pillowcases? Weekly at minimum, and twice a week if you use products on your skin or hair, or go to bed without showering.
What temperature should sheets be washed at? Warm for ordinary cleaning. Hot, around 130 degrees Fahrenheit, if dust mites are the reason. A hot tumble dry achieves much of the same result if your machine cannot reach it.
How often should you wash a mattress protector? Every one to two months, warm rather than hot, and out of the hot dryer if it is waterproof, because heat degrades the laminate.
Can you wash a duvet at home? Most synthetic ones yes, in a large machine. Down usually needs a commercial machine, and the drying matters more than the washing, because a duvet that is not completely dry develops a smell. The two constructions are compared in comforter vs duvet.
The bottom line
Weekly for sheets and pillowcases, and use the table for everything else, because the protector, the pillows and the duvet are what most people forget. If dust mites are the point, the temperature matters more than the frequency, and a second set of sheets is what makes any of it happen.
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