A pillow can look clean inside its pillowcase while gradually collecting sweat, oils and dust. Some pillows can be machine washed and thoroughly dried; others, particularly many memory-foam and latex types, can be permanently damaged by water. The label matters more than a general instruction to wash everything on a hot cycle.
If you know what your pillow is filled with, cleaning becomes straightforward. Start by checking the care instructions, remove the pillowcase and protector, then choose the right method for the filling.
Identify the filling first
Common pillows contain polyester fibre, down, feathers, memory foam or latex. Each material responds differently to washing and drying.
Many polyester pillows are machine washable. Some down and feather pillows can also be washed under specific conditions, but delicate covers and wet filling need careful handling.
Solid memory foam and latex are generally not suitable for immersion in a washing machine. The manufacturer may permit only surface cleaning or washing a removable cover.
Read every label
Look for the care label sewn into the pillow's seam. Follow its temperature limits, washing symbols, detergent guidance and whether tumble drying is permitted.
If the label has been removed, identify the brand and model if possible. The Sleep Foundation recommends checking manufacturer instructions before washing because different fillings require different treatment.
Don't guess that 'gentle' always means machine safe. A gentle machine cycle still saturates the filling and subjects it to spinning.
Inspect seams before washing
Check the pillow for loose stitching, holes and thinning fabric. A small tear can become much larger in a washing machine.
If feathers or polyester fibres are already escaping, repair the cover according to the manufacturer's guidance or consider replacement. Loose filling can also create problems for the washing machine.
Heavily damaged pillows may not survive laundering and might not be comfortable afterwards even if the cover stays intact.
Remove pillowcases and protectors
Wash outer pillowcases and removable protectors according to their own care labels. These often tolerate more frequent washing than the pillow itself.
If the pillow has a zipped removable cover, check whether the cover can go into the machine while the core must remain dry.
Keep the clean bedding aside until the pillow has dried completely. Putting a fresh protector over a damp core traps moisture.
How to machine-wash a polyester pillow
If the label allows, use a suitable gentle programme with the recommended water temperature and a measured amount of mild laundry detergent.
Avoid overloading the drum. Some machines balance better with two similar pillows, but only when their size and the appliance capacity permit it.
Choose an appropriate extra rinse if detergent remains in the filling. Don't assume more detergent gives a cleaner pillow; residue can make fibres feel stiff.
Washing down and feather pillows
Down and feather pillows may require a gentle cycle, a suitable detergent and careful thorough drying. Follow the product label.
Use a spacious washing machine so the pillow can move freely without being crushed into a tight bundle. A very large pillow may be better taken to a professional laundry with suitable equipment.
Inspect carefully after washing for clumps, unpleasant odour or feathers protruding through the cover. A pillow that remains wet deep inside can develop problems despite looking dry on the surface.
Why memory foam should not be soaked
Memory foam is made of a structure that can break down or retain water when saturated. Many makers explicitly instruct users not to immerse or machine wash the foam core.
For suitable foam pillows, remove and wash the cover if allowed, then gently spot-clean the core according to the manufacturer's instructions.
Don't wring, twist or tumble-dry a solid foam pillow unless the maker explicitly permits it. Heat and mechanical stress can damage the material.
Spot-cleaning a non-washable pillow
Use a clean cloth lightly dampened with a manufacturer-approved cleaning solution. Blot the affected area rather than saturating it.
Follow with another suitable cloth to remove residue if instructed. Do not pour a cup of water through a foam pillow in the hope of rinsing away a stain.
Allow the pillow to air completely in suitable conditions before putting the cover back on. Check more than just the visible surface.
Drying is the most important stage
A damp pillow can smell musty and may encourage microbial growth. The filling must be thoroughly dry before you sleep on it.
If tumble drying is permitted, choose the label's recommended temperature and programme. Pause occasionally to feel for damp areas and break up clumps gently.
Some washable fibre or down pillows take much longer to dry than a bedsheet. A cycle ending does not prove the middle is dry.
Can dryer balls help?
Suitable clean dryer balls may help separate filling and improve movement in a tumble dryer when the pillow manufacturer permits them.
Don't use rough objects that could damage delicate covers. Follow the dryer instructions and avoid overloading.
Take the pillow out and fluff it gently between cycles if necessary. Continue drying until no cool damp patches remain in the centre.
Air-drying washable pillows
If tumble drying isn't permitted, lay the pillow flat in a well-ventilated place on a suitable drying rack, turning it regularly as advised.
Allow plenty of time. Thick filling can hold moisture deep inside, particularly in a cool British home.
Avoid leaving the pillow in a damp room and hoping it will dry overnight. If you cannot dry a thick washable pillow properly, use a suitable professional facility rather than putting it back on the bed wet.
Removing odours
Sometimes washing a compatible pillow removes ordinary body oils and smells. Other odours may indicate that filling has been damaged or stayed damp for too long.
Don't mask persistent mustiness with strong perfume. Investigate moisture and consider whether replacement is more sensible.
A washable protector between pillow and pillowcase can reduce staining and make regular bedding care easier.
How often should pillows be washed?
Frequency depends on use, filling, cover protection and manufacturer instructions. Some makers recommend periodic washing, while others say the core should never be washed.
Wash pillowcases regularly and follow appropriate laundry hygiene guidance. A removable protector is often the easiest layer to maintain.
You don't have to wash a foam core every month to keep your bed clean. Correct use of washable covers and occasional safe surface care may be better.
Washing pillows after illness
If a pillow is contaminated by bodily fluids, follow the care label and appropriate laundry-hygiene guidance. Some materials cannot be disinfected safely at home.
Don't assume a low-temperature cosmetic wash is adequate for every contamination situation. A damaged or heavily soiled non-washable pillow may need replacement.
Keep soiled bedding separate from clean items during handling, wash hands afterwards and follow public health advice when dealing with infectious illness.
Signs that a pillow should be replaced
A pillow that remains flat, lumpy, unsupportive or persistently odorous after suitable care may have reached the end of its useful life.
Large stains, a failing cover or foam breaking into pieces are other warning signs. Washing cannot restore the original resilience of exhausted filling.
Your sleeping comfort matters too. If you constantly fold the pillow to support your head, a new pillow may be more useful than another cleaning cycle.
The safest routine
Identify the filling, read the label, wash only what is washable and dry the entire pillow thoroughly. If the core cannot be washed, keep its cover clean and spot-clean only as directed.
Never choose an aggressive programme just because the pillow looks grubby. The wrong wash can ruin its structure and leave it harder to dry safely.
A pillow that is properly cared for should stay comfortable as well as clean. Protect the filling first, and only then choose the cleaning method.