Caring for a cotton pillow

Can a cotton pillow go in the washing machine?

Sometimes, but usually only the cover. Four of five seller pages read say to keep the cotton fill dry and spot clean it instead.

Almost any pillow fits in a drum, and the trouble starts once it is wet. Of 5 cotton-filled pillow pages counted for the full guide, 4 say to keep the fill dry and spot clean it, and 1 gives machine-wash steps. Water does not weaken the cotton fiber itself. The risk is batting that shifts into lumps and a core that stays damp.

Makers that allow a wash still warn about the middle. Organic Textiles walks owners through washing and a low dryer setting, and warns that outer layers may look dry while inner layers stay moist (Organic Textiles). The full answer, with the seller count and step-by-step care for both kinds of label, is in Can you wash a cotton pillow, and what happens if you do?.

Why do cotton pillow care labels disagree with each other?

Each label is written for one build of fill. Most say spot clean only, one gives machine steps, and all of them protect the cotton core.

Care labels on cotton pillows split into two camps. Lifekind says to spot clean its cotton pillow only (Lifekind). Sachi Organics says spot clean only and not to machine wash the cotton fill (Sachi Organics). The Futon Shop says not to put its natural pillows in the washing machine and to air them in the sun instead (The Futon Shop).

Fill sellers give the reason. HoneyBeGood does not recommend machine washing its cotton stuffing because, as a purely organic material, it clumps up a bit (HoneyBeGood). The labels that allow a wash are written for fill built to take one, and they pair it with slow, low drying.

A label written for one pillow does not carry over to another. A pillow with no label left is safest treated as spot clean only, with the cover doing the washing.

Why does drying time decide whether washed cotton survives?

A thick cotton core dries from the outside in. If the middle stays wet too long, the fibers mat together and mold has time to grow.

Cotton holds a lot of water. Textile engineers list its moisture regain at 8.5% of its dry weight, against 0.4% for polyester (ACS ChemMatters). A bed pillow packs that thirsty fiber into a dense block, and all of it has to dry from the center outward.

Mold is the reason the clock counts. The EPA says that in most cases mold will not grow if wet or damp items are dried within 24 to 48 hours (EPA). A cotton core still damp after that is outside the window, and a musty smell is the usual sign.

The middle can be checked by hand. Squeeze the center hard and press it to the inside of the wrist. A cool spot means water is still in there, and the pillow needs more drying before the zipper closes.

What keeps dust mites down when the cotton fill stays dry?

A tightly woven cover and hot washes of everything that can take them. Allergy advice puts the hot water on the cover, not the fill.

Medical advice on dust mites leans on heat. The Mayo Clinic advises washing sheets, pillowcases and bedcovers weekly in water of at least 130 F (Mayo Clinic). Cotton batting cannot take that wash, so the hot water goes on the parts that come off.

Home water may not reach that heat. The Consumer Product Safety Commission urges setting home water heaters to 120 F to prevent scalds (CPSC). The Mayo Clinic also advises allergen-blocking covers of tightly woven fabric on pillows. A zippered protector that takes a hot wash does more for an allergy than washing the cotton inside.

Why does a cotton pillow go flat, and how much comes back?

Cotton fibers bend under a head and hold the new shape. Fluffing brings back the height lost to clumping, never the height lost to set fibers.

Cotton recovers poorly from bending. A review of anti-wrinkle research puts the elastic recovery of cotton fibers at only about 70% (PMC). Each night the fibers under the head bend a little, and some of that bend stays.

Sellers that give a figure expect a lot of loss. earthSake says about a third of the height goes, and Lifekind says cotton fillings compress by about half over time (Lifekind). Part of that is clumping and stored moisture, which fluffing and airing undo. Part is fiber that has set, which only new cotton replaces.

The split between the two, with a table of which losses come back, is in Why do cotton pillows flatten, and how much of it can you reverse?.

Do a dryer and sunlight help a flat cotton pillow?

A cool dryer and short spells of sun dry the fill and loosen clumps. Long sun weakens cotton, so an hour a side beats whole days outside.

A dryer does the work of fluffing with less effort, and the sellers that allow it keep the heat low. earthSake says its pillows can go in the dryer only with no heat or on air fluff (earthSake). Sachi Organics tells owners to fluff daily by hand to keep the fill even (Sachi Organics).

Sun dries and freshens the fill, and earthSake advises an hour on each side every 3 months. The limit is ultraviolet light. Cotton tent fabric lost 40% of its tensile strength after 500 hours of UV aging (Structural Investigation of UV Aged Tent Fabrics). A few hours a year is a small dose. A pillow left on a sunny sill every day keeps adding to it.

What does a zipper change about caring for a cotton pillow?

It lets the fill come out so the shell can be washed, lets clumps be teased apart, and lets new cotton go in once the old has set.

A zipper turns a cotton pillow into parts that can be cared for one at a time. One seller of zippered cotton shells says to remove any inner material before washing and to dry the shell on low heat (Cece's Wool). The fabric gets clean, and the cotton never has to go through a slow, risky dry.

A second layer helps more. earthSake says its pillow is not washable and sells machine washable organic cotton muslin covers, zippered protectors, for every size (earthSake). It recommends that layer beneath the pillowcase to keep the pillow fresh and free of stains.

The zipper also opens the fill for upkeep. Clumped tufts can be pulled apart by hand, damp fill can be spread out to dry, and spare cotton can go back in once the pillow settles. A sewn-shut pillow allows none of this, so its care ends at the cover.

When does a cotton pillow need new cotton instead of more fluffing?

When it sinks back within minutes of fluffing, or when the batting has matted into hard sheets that stay in layers when pulled.

Two signs mark the point. The first is a pillow that sinks back within minutes of fluffing, which suggests the fibers have set. The second is fill that has matted into hard, felt-like sheets that will not tease apart by hand.

From then on the fix is more cotton, and a zipper makes it possible. Sachi sells refill by the half pound and says that amount is typically enough to restore a standard pillow (Sachi Organics). Organic Textiles sells extra filling of natural fibers to add to an existing pillow (Organic Textiles). Keeping the original fill weight on record makes a top-up easier to size.

What the cotton inside is, and the forms that go back in, are covered on the cotton fill page.

Which cotton fill questions are answered in full?

• Can you wash a cotton pillow, and what happens if you do?
• Why do cotton pillows flatten, and how much of it can you reverse?
• Why do cotton pillows ship compressed in plastic, and how do they recover?
• Why does a new cotton pillow smell, and how long does the smell take to fade?

Common questions

Can you put a cotton pillow in the dryer?
Some makers allow it on no heat or air fluff only. Low heat and short cycles keep the fibers from being worked hard while dry, and the center needs checking before the pillow goes back on the bed.

How often should a cotton pillow be aired?
One seller advises taking the cover off and setting the pillow in sun and air every 3 months, for one hour on each side. Airing dries stored moisture out of the fill.

Does washing a cotton pillow get rid of dust mites?
Hot water works, at 130 F or more by the Mayo Clinic's advice, but cotton batting rarely survives that wash. A washable, tightly woven cover washed hot does the job instead.

Why does my cotton pillow smell musty after washing?
The middle stayed damp too long. The EPA says mold will not usually grow on items dried within 24 to 48 hours, and a dense cotton core can stay wet past that.

Sources

The cotton spec sheet's outside references, one line apiece, tagged with the section that cites them.

1. Organic Textiles (organictextiles.com), cited under “Can a cotton pillow go in the washing machine?”.
2. Lifekind (lifekind.com), cited under “Why do cotton pillow care labels disagree with each other?”; “Why does a cotton pillow go flat, and how much comes back?”.
3. Sachi Organics (sachiorganics.com), cited under “Why do cotton pillow care labels disagree with each other?”; “Do a dryer and sunlight help a flat cotton pillow?”.
4. The Futon Shop (thefutonshop.com), cited under “Why do cotton pillow care labels disagree with each other?”.
5. HoneyBeGood (honeybegood.com), cited under “Why do cotton pillow care labels disagree with each other?”.
6. ACS ChemMatters (acs.org), cited under “Why does drying time decide whether washed cotton survives?”.
7. EPA (epa.gov), cited under “Why does drying time decide whether washed cotton survives?”.
8. Mayo Clinic (mayoclinic.org), cited under “What keeps dust mites down when the cotton fill stays dry?”.
9. CPSC (cpsc.gov), cited under “What keeps dust mites down when the cotton fill stays dry?”.
10. PMC (pmc.ncbi.nlm.nih.gov), cited under “Why does a cotton pillow go flat, and how much comes back?”.
11. earthSake (earthsake.com), cited under “Do a dryer and sunlight help a flat cotton pillow?”; “What does a zipper change about caring for a cotton pillow?”.
12. Structural Investigation of UV Aged Tent Fabrics (dergipark.org.tr), cited under “Do a dryer and sunlight help a flat cotton pillow?”.
13. Cece's Wool (ceceswool.com), cited under “What does a zipper change about caring for a cotton pillow?”.
14. Sachi Organics (sachiorganics.com), cited under “When does a cotton pillow need new cotton instead of more fluffing?”.
15. Organic Textiles (organictextiles.com), cited under “When does a cotton pillow need new cotton instead of more fluffing?”.