Quick answer
For most cotton, polyester and microfiber pillowcases: check the care label, turn the cases inside out, pre-treat any visible oil or makeup, and wash with a normal detergent on the warmest temperature the label allows. Rinse well and dry completely. For yellowing, a soak in an oxygen-based whitener (not chlorine bleach) is a common next step, as long as the label and the product instructions allow it. Silk and satin need a gentler approach, covered in our silk pillowcase guide.
Check the care label first
The label tells you the fiber, the highest wash temperature and whether bleach is acceptable. Cases made of cotton or percale usually tolerate warmer water and stronger stain treatments. Bamboo-derived rayon, silk, satin and decorative cases are often more delicate, and some say hand wash or dry clean only. If there is no label, treat the case as delicate: cool water, mild detergent, low heat.
Why pillowcases turn yellow or dingy
Your face and hair spend hours against the fabric every night. Most yellowing comes from what builds up there:
- Body oils (sebum) and sweat, which can oxidize in the fabric and leave a yellow cast over time.
- Skincare, sunscreen, night creams and hair products.
- Laundry residue: too much detergent, fabric softener or dryer sheets can leave a film that holds on to oil. Some bedding experts also point to buildup of optical brighteners in detergents as a cause of a dull look.
- Drying or storing cases while still slightly damp.
Why does one person’s pillowcase turn yellow faster? Skin oil production, sweating, hair products, skincare and whether someone goes to bed with damp hair all differ from person to person. A pillowcase that yellows faster is usually a sign of more buildup, not of poor washing by anyone.
Brown stains after sleeping can come from makeup, self-tanner, hair dye, hair oils, blood from a small cut or blemish, or old oil residue. Unknown brown marks are worth treating gently and testing in a hidden area first. If you see blood often, or marks that appear with skin irritation, it can be worth mentioning to a doctor or pharmacist.
Everyday wash method
- Remove the cases and close any zippers or envelope flaps so they do not snag.
- Turn them inside out. This reduces friction on the outer surface.
- Wash with sheets or items of a similar color and fabric. Do not overload the machine; cases need room to rinse out detergent.
- Use a measured amount of regular detergent. More detergent is not cleaner and can leave residue.
- Choose the warmest temperature the label allows for whites and light cotton, and cooler water for colors and delicate fibers. Our guide on whether hot water cleans better than cold explains the trade-offs.
- Skip fabric softener and dryer sheets if your cases are yellowing or dull, since they can leave a film.
- Consider an extra rinse if you use a lot of skincare or live with hard water.
Pre-treating oil, makeup and sweat marks
Apply a small amount of liquid laundry detergent to the stain, gently work it in with your fingers or a soft brush, and leave it for 10 to 15 minutes before washing. Some guides also suggest white vinegar on makeup or oil spots. If you try it, use it on its own and rinse well before the wash.
Do not rub hard on colored or patterned cases, and test any stain treatment on a hidden seam first. Check the stain after washing and before drying. Heat can set some marks, so rewash rather than tumble-drying a case that still shows a stain.
Getting yellowed pillowcases white again
For white or colorfast cotton and percale, a common method is:
- Fill a clean basin or the machine with warm water as the label allows.
- Dissolve an oxygen-based laundry booster (often sold as oxygen bleach or sodium percarbonate) following the package directions. Some experts suggest first soaking in water with an enzyme laundry detergent for 30 minutes to an hour.
- Submerge the cases and soak for the time on the package, which is often several hours for stubborn yellowing.
- Rinse thoroughly, then wash as normal.
- Check the result before drying. Repeat if needed.
Oxygen bleach is generally gentler than chlorine bleach, but it still needs gloves, ventilation and attention to the label. Do not use it on silk or wool.
Safety notes for soaks
- Use gloves and keep the room ventilated.
- Keep cleaning products, soak basins and detergent pods out of reach of children and pets. Soaking buckets can be tempting to curious toddlers and animals, so do not leave a basin unattended.
- Pour out and rinse the basin when you are done.
- Wear eye protection if you are likely to splash.
Chemical safety: what never to mix
Never mix chlorine bleach with ammonia or with vinegar or other acids. Those combinations can release toxic gases (chloramine or chlorine gas). Do not mix bleach with other cleaners, and do not add oxygen bleach and chlorine bleach to the same load “for extra power.”
If you want to use vinegar as a rinse aid, do it in a separate wash cycle from any bleach, and never in the same container or drum at the same time. For most households the simplest approach is to pick one product per wash, follow the label, and rinse well. If you do inhale fumes and feel unwell, move to fresh air and contact your local poison control center or emergency services.
Drying and storing
Tumble dry cotton and polyester cases on low or medium heat, or line dry. If cases take a long time to dry, a clogged dryer vent may be the cause; see the benefits of dryer vent cleaning. Take them out while still very slightly warm and fold or put them on the bed promptly to limit wrinkling. Make sure they are fully dry before storing, since damp fabric can develop a musty smell and mildew. Sun can help brighten white cotton, but it can fade colors and weaken some fibers, so use it only for whites.
How often to wash pillowcases
Sources differ, and the right answer depends on how much you sweat, whether you use hair or skincare products and whether you have acne or allergies. A common recommendation is at least weekly. Some people with oily skin or heavy skincare routines change cases more often, even every few days, and keeping a spare set makes this easy. Allergy-prone people may want to wash weekly in warm water if the fabric allows.
Silk, satin and other delicate cases
Silk and satin should generally not go through the same routine: no chlorine or oxygen bleach, no hot water, no tumble dry. Follow our guide on how to clean a silk pillowcase. If you are also using a silk-filled duvet, see how to clean a silk comforter, because the rules differ again.
Throw pillow covers are a different category: many have zippers, prints or trims that need their own check of the label.
Preventing yellowing
- Wash cases often, and keep a rotation set.
- Let night creams and hair products absorb or dry before lying down, and avoid going to bed with damp hair.
- Use the correct amount of detergent and consider an extra rinse.
- Limit fabric softener and dryer sheets on cases that hold oils.
- Use a washable pillow protector to guard the pillow itself.
- Wash pillows too, as labeled, since oils soak into the pillow and transfer back.
Troubleshooting
| Problem | Likely cause | What to try |
|---|---|---|
| Overall dingy or gray look | Detergent or softener buildup, under-rinsing | Wash without softener, use less detergent, add a rinse |
| Yellow patch where the face rests | Oils and skincare | Pre-treat, then an oxygen-booster soak if the label allows |
| Brown spots | Makeup, hair color, blood, tanner | Spot test, cold water for blood, gentle detergent, rewash before drying |
| Musty smell after washing | Not fully dry, or overloaded wash | Rewash, dry completely, do not overload |
| Stain returns after drying | Heat set a residual stain | Re-treat and rewash; avoid the dryer until it is gone |
FAQ
How do I get dingy pillowcases white again? Reduce residue (less detergent, no softener, extra rinse), then try an oxygen-based soak on white or colorfast cotton. Avoid chlorine bleach unless the label allows it, and never combine it with other cleaners.
How do I get the yellow out of a pillowcase? Pre-treat with detergent, soak in an enzyme detergent and then oxygen booster if the fabric allows, rinse and wash again. Check before drying.
Can I wash pillowcases with sheets? Yes, if the fabric and color are similar. Give the load room.
Do pillowcases need to be replaced? If they stay stained, feel stiff or have worn thin after proper washing, replacement is reasonable.