TL;DR
A headband sits against the hairline, which is one of the oiliest parts of the scalp, and it collects sweat, sebum, dry shampoo, styling product, and makeup. Sort by material before you wash anything: fabric goes in cool water by hand or in a mesh bag, plastic and resin get scrubbed with soap, and leather and suede only get wiped. Everything dries flat, never in a dryer.
What builds up on a headband
Three sources, mixing into one film.
Scalp oil and sweat. The hairline produces sebum constantly, and a headband presses fabric or plastic into it for hours. Sweat adds salt, which dries into crystals that make fabric stiff and scratchy.
Hair product. Dry shampoo is the worst offender, because it is designed to absorb oil and it ends up transferring to whatever touches the hair. Hairspray, gel, and mousse all leave a sticky residue that dust then sticks to.
Makeup and skincare. Foundation, sunscreen, and moisturizer at the hairline transfer directly onto the inside edge of a band.
That mix is why the underside of a headband darkens before the outside shows anything, and why a band can smell faintly sour even when it looks fine.
Wearing a dirty headband puts that residue back into clean hair. The same logic applies to brushes, covered in how to clean a hairbrush and remove buildup.
How do you clean a fabric headband?
Hand wash it in cool water with a small amount of gentle detergent, squeezing rather than wringing, then rinse until the water runs clear and press it in a towel. Reshape it and lay it flat to air dry. A mesh laundry bag on a delicate cycle works for sturdy cotton bands.
Fabric and knit headbands
Check for a care label first. Many do not have one, in which case treat the band as delicate.
Fill a bowl with cool water and a small amount of gentle detergent. Cool water matters: hot water sets protein stains from sweat and skin, and it shrinks knits.
Let the band soak for ten to fifteen minutes, then work the inside edge gently with your fingers. That edge is where the buildup is. Rinse in clean cool water until no suds appear, since detergent left in fabric is stiff and irritates skin.
Press the water out in a towel rather than wringing, which distorts elastic. Reshape while damp and lay flat to dry, away from direct heat -- a radiator or a dryer will kill the elastic.
Machine washing is fine for plain cotton bands and workout bands: put them in a mesh laundry bag, use a cool delicate cycle, and skip the dryer. Skip fabric softener too, since it coats fibers and reduces the absorbency that makes a sweatband useful. That is the same reason softener is wrong for how to clean reusable cotton rounds.
Plastic, resin, and metal headbands
These are the easy ones, with one caution about heat.
Wash them in warm -- not hot -- water with a drop of dish soap, using a soft toothbrush along the inside curve and around any teeth. Hot water can warp thin plastic and soften the glue on decorated bands.
Rinse thoroughly and dry with a soft cloth, then let the band air out fully before storing.
For a sticky residue that soap will not shift, a cloth dampened with a mild vinegar solution -- one part white vinegar to three parts water -- works on plain plastic. Rinse afterward. Do not use it on decorative finishes or plated metal, and never combine it with any other cleaner.
Metal bands and metal-toothed combs wash the same way, but dry them immediately and completely. Water sitting in a joint or under a decorative element causes rust and corrosion. Plated decorative elements are thin and wear through if you scrub them, so wipe rather than polish.
Why does my headband smell even after washing?
Odor that survives a wash usually means the buildup was not fully removed or the band was stored while damp. Soak it longer in cool water with detergent, work the inside edge with your fingers, rinse until the water runs completely clear, and make sure it dries fully flat before it goes in a drawer.
Velvet, suede, leather, and embellished bands
These do not get washed.
Velvet and velour flatten permanently when soaked. Brush them with a soft clothing brush, spot clean with a barely damp cloth and a little gentle soap, blot dry, and lay flat.
Leather and suede bands get wiped only. A barely damp cloth for leather, dried immediately, and a suede brush for suede. Water leaves permanent marks on both.
Bands with glued rhinestones, beads, or fabric flowers should never be submerged, since the adhesive softens and the decorations come off. Spot clean around them with a cotton swab. Silk and satin need cool water and a delicates detergent.
If you are not sure what a band is made of, treat it as the most delicate possibility. The general principle of matching method to material runs through cleaning the personal items you use every day.
How often, and when to replace
Bands worn during exercise should be washed after every use or two, because sweat is the fastest source of both odor and stiffness.
Everyday fabric bands do well washed weekly. Plastic and metal bands can go two to four weeks with a quick soapy scrub.
Replace a band when the elastic has stretched and no longer holds, when fabric stays discolored after washing, when plastic has cracked or gone brittle, or when teeth have broken off a comb section. Cracked plastic snags and breaks hair.
A band that has been through an illness is worth washing before it goes back into rotation, in the same way you would replace or clean a toothbrush.
Source: American Academy of Dermatology consumer guidance on hair and scalp care
Storing them so they stay clean
Do not toss headbands loose in a drawer with hairbrushes and clips. They pick up hair and dust and get bent.
A small box, a hanging organizer, or a dedicated drawer section keeps them in shape. Store plastic bands lying flat or on a form rather than compressed, since long-term compression warps them.
Keep them out of the bathroom if you can. Humidity slows drying and encourages mildew on fabric.
Clips and claws have similar storage problems, covered in how to clean hair clips and claw clips.
FAQ
Can you put headbands in the washing machine?
Plain cotton and workout headbands can go in a mesh laundry bag on a cool, delicate cycle. Skip the dryer, which destroys elastic. Do not machine wash velvet, suede, leather, silk, or anything with glued decorations, wire, or beads, since those either flatten, mark, or come apart.
How do you get sweat smell out of a headband?
Soak it for ten to fifteen minutes in cool water with a gentle detergent, working the inside edge with your fingers where the buildup is heaviest. Rinse until the water runs completely clear, press the water out in a towel, and dry it flat. Odor that returns means it was stored damp.
Should you use hot water to wash headbands?
No. Hot water sets protein stains from sweat and skin oil, shrinks knits, damages elastic, and can warp thin plastic or soften the glue on decorated bands. Cool water for fabric and warm water for plastic handles the buildup without any of those risks.
How often should you wash a headband?
Wash workout bands after every one or two wears, since sweat drives both odor and stiffness. Everyday fabric bands do well with a weekly wash. Plastic and metal bands can go two to four weeks with a quick scrub in warm soapy water and a thorough drying.
Can you clean a velvet headband?
Not by washing it. Soaking flattens the pile permanently. Brush it with a soft clothing brush, spot clean marks with a barely damp cloth and a trace of gentle soap, blot with a dry towel, and lay it flat to air dry away from heat. Serious stains are a dry cleaner question.
Why do plastic headbands get sticky?
Sticky film is hair product mixed with scalp oil, most often hairspray or dry shampoo that has transferred from hair to the band. Warm water with a drop of dish soap and a soft toothbrush along the inside curve removes it. A mild vinegar solution works on plain plastic if soap is not enough.
Small things stay nicer in a home that is not fighting dust. If you would rather hand that off, get a quote or read more about house cleaning services.