Skip to content
HassleFix
KitchenCleaningLaundryBathroomBedroom & SleepAir & TemperatureSmall Spaces & StorageHome Office & CablesPetsOutdoor & Garage
How we pick About

Comforter Smells Bad After Washing? The Reset That Fixes It

A comforter that smells worse after washing is usually damp inside or full of soap. Reset it with an extra rinse and a full dry, then try an odor booster.

By Jamilur Rahman Updated November 5, 2026 · 8 min read

Time
3 hours, mostly machine time
Cost
Under $20
Difficulty
Easy
A thick white comforter half pulled out of a front-load washing machine in a bright laundry room
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. Is it the washer or the comforter?
  9. How to tell a comforter is really dry
  10. What to skip
  11. FAQ
  12. Related problems

Quick answer

If your comforter smells bad after washing, it is usually still damp deep inside the filling, or it is holding soap and body oils that a crowded wash never rinsed out. Rewash it alone in the hottest water the care label allows with a cup of white vinegar and an extra rinse, then dry it all the way. A laundry odor eliminator booster is the add-on for funk that survives a plain reset.

Free fix vs. permanent fix

Free fix · 3 hours, mostly machine time

Hot wash, vinegar rinse, full dry

  • Wash it alone in the hottest water the care label allows
  • Add 1 cup of white vinegar to the rinse and run an extra rinse
  • Dry on low or medium with dryer balls, fluffing every 30 minutes
  • Finish in sun and a breeze if the center still feels cool

How long it lasts: Often for good, when the cause was damp filling or leftover soap. If the smell returns after a few nights, body oils or pet odor are the cause, or the washer itself smells.

Most readers choose Permanent fix
Laundry odor eliminator booster (illustration)
Illustration

A laundry odor eliminator booster

Heat, vinegar and a full dry handle dampness and soap. A booster made for odors goes after the body oils and bacteria byproducts that plain detergent leaves behind, which is what brings the smell back on sweaty or pet-heavy bedding.

What to get: Laundry odor eliminator booster

How long it lasts: It works wash by wash. Add it to the wash each time and the odor has little chance to build up again.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • White vinegar

    1 cup in the rinse cycle breaks down soap residue

    You have it

  • Baking soda

    Half a cup in the drum helps soften the smell

    You have it
  • Wool dryer balls (illustration)
    Illustration

    Wool dryer balls

    Lift and separate the filling so the center dries instead of staying damp

    Check price
  • Our pick
    Laundry odor eliminator booster (illustration)
    Illustration

    Laundry odor eliminator booster

    For stubborn sweat, pet or musty smells that a vinegar wash does not clear

    Check price
  • Washing machine cleaner tablets (illustration)
    Illustration

    Washing machine cleaner tablets

    Only if towels and sheets smell too, which points at the machine

    Check price

Why it happens

1

Filling that never dried

A big comforter can feel dry on the outside while the center stays wet. Damp filling grows mildew, and you smell it a day or two later as a musty or wet-dog odor.

2

Soap and softener residue

Too much detergent or fabric softener leaves a film that traps body oils. The film turns sour when it warms up on your bed.

3

A crowded wash

A king comforter in a small drum barely moves, so water never flushes through the fill. Dirt and soap stay trapped inside.

4

A smelly washer

A musty drum, rubber gasket or detergent drawer passes its smell to everything it cleans. If towels and sheets smell too, suspect the machine.

5

Oils and pet odor in the fibers

Skin oils and fur soak into the fill. Cold, short cycles lift surface dirt but not oils, so the smell returns when the comforter warms up.

Try this first (free)

Do these in order, starting with the simplest.

  1. Check the care label and shake it out

    See whether hot water and a dryer are allowed. Down and silk fills often need a gentle cycle and low heat. Shake the comforter outside to knock out loose dust.

  2. Wash it alone with vinegar and an extra rinse

    Tool used: White vinegar

    Use the largest drum you can get, such as a laundromat front-loader, and wash one comforter at a time. Use the hottest water the label allows and half the usual detergent. Pour 1 cup of white vinegar in the softener slot and add a second rinse. Never mix vinegar with bleach.

  3. Dry it all the way with dryer balls

    Tool used: Wool dryer balls

    Tumble on low or medium with wool dryer balls. Stop every 30 to 40 minutes and shake it out. Plan on two or three rounds. It is dry when there is no cool or clammy spot in the center and no smell when you press your nose into the middle.

    Wool dryer balls (illustration)
    Illustration

    Tool for this step

    Wool dryer balls · Lift and separate the filling so the center dries instead of staying damp

    Check price on Amazon

  4. Finish outside if the center is cool

    Hang it over a line or railing in sun and a breeze for a few hours. Fresh air carries off leftover odor and finishes the drying.

  5. Rewash with a booster if the smell is still there

    Tool used: Laundry odor eliminator booster

    For wet-dog, sweat or stale smells that survive the vinegar wash, run another wash in warm or hot water and add the booster at the dose on its label. Dry it fully again.

    Laundry odor eliminator booster (illustration)
    Illustration

    Tool for this step

    Laundry odor eliminator booster · For stubborn sweat, pet or musty smells that a vinegar wash does not clear

    Check price on Amazon

  6. Clean the washer if everything smells

    Tool used: Washing machine cleaner tablets

    If sheets and towels come out smelling too, run an empty hot cycle with washer cleaner tablets, wipe the door gasket, and leave the door open between loads.

    Washing machine cleaner tablets (illustration)
    Illustration

    Tool for this step

    Washing machine cleaner tablets · Only if towels and sheets smell too, which points at the machine

    Check price on Amazon

When free fixes aren't enough

If the comforter smells fine out of the dryer and musty again after a night or two, the smell is in the oils and bacteria byproducts in the fabric, not in leftover soap. Vinegar rinses soap away but it does not target those. A second wash with a laundry odor eliminator booster does. If the smell survives two booster washes, or you see black, green or gray spots, the filling is moldy. Replace the comforter rather than washing it again.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Our picks compared
PickProductFixesWho it's forBuy
Best pick
Laundry odor eliminator booster (illustration)
Illustration
Laundry odor eliminator booster
sour, musty or pet smells that survive a vinegar wash Anyone whose comforter picks up sweat or pet odor and smells again after a normal wash. Check price
Budget pick
Wool dryer balls (illustration)
Illustration
Wool dryer balls
a center that stays damp because the filling clumps Anyone who wants the cheapest upgrade to the drying step. Check price
Best pick
Laundry odor eliminator booster (illustration)
Illustration

Laundry odor eliminator booster

Fixes: sour, musty or pet smells that survive a vinegar wash

Look for: Labeled to remove odors in the wash, not just add scent; Safe for high-efficiency machines if you have one; Works in warm or hot water on bulky items; An unscented version if you are sensitive to fragrance.

Who it's for
Anyone whose comforter picks up sweat or pet odor and smells again after a normal wash.
Honest downside
The comforter is moldy or still damp inside. A booster cannot fix mold, and a damp center needs more drying, not more product.
Check price on Amazon
Budget pick
Wool dryer balls (illustration)
Illustration

Wool dryer balls

Fixes: a center that stays damp because the filling clumps

Look for: 100 percent wool, not wool-blend felt; Large size that separates a bulky comforter; A set of four or more so they can share the load.

Who it's for
Anyone who wants the cheapest upgrade to the drying step.
Honest downside
You are allergic to wool. Clean tennis balls in a clean sock are a stopgap.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on garment care labels, washer and dryer manuals, general laundry guidance for drying bulky bedding, and what owners report in reviews of laundry odor boosters and dryer balls. We do not test products by hand.

Is it the washer or the comforter?

Wash a towel and a pair of sheets next. If they come out smelling fine, the problem is how the comforter was washed or dried. If they smell the same, the washer is the source. Clean the drum and gasket, leave the door ajar, and use less detergent.

How to tell a comforter is really dry

Reach into the center of the comforter and press your palm there. It should feel as warm and light as the edges, with no cool, heavy patch. Down fills often take two hours or more in the dryer, and a king can take longer. A comforter that feels dry on the outside can still hold a pint of water in the middle.

What to skip

More softener, scented sprays and bleach

Extra softener coats the fibers and traps odor. A perfume spray covers the smell for a day and leaves it underneath. Skip bleach on down and colored fills; it does not cure a damp-filling smell.

Frequently asked questions

Why does my comforter stink after washing, or smell after drying?
If your comforter smells weird after washing, or smells bad after drying, there are two usual causes. The center of the filling stayed damp, so mildew started, or soap and softener residue is still in the fibers and goes sour with body heat. A hot wash with a vinegar rinse, an extra rinse and a full dry fixes both.
Why does my duvet smell after washing, and why does my duvet cover smell too?
Same causes. A duvet insert holds water like a comforter, so it needs the same long, low dry. If your duvet cover smells after washing, it likely sat damp in the drum or the washer smells. Move covers to the dryer right away and add a cup of vinegar to the rinse.
Why does my blanket stink after washing, and how do I get the musty smell out of a duvet or blanket?
Rewash it with a cup of vinegar in the rinse, dry it completely, then air it in sun and a breeze. When a blanket smells bad after washing, or still smells musty, wash it again with an odor booster and dry it fully.
Why does my comforter smell like mildew or wet dog?
If your comforter smells like mildew after washing, or smells like wet dog, it is a damp-fabric smell. Bacteria and mildew grow in moist filling, and the odor returns when the comforter warms up. Rewash it with a booster and dry it all the way. Visible mold spots mean it is time to replace it.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Laundry odor eliminator booster (illustration)
Illustration

Our pick: Laundry odor eliminator booster

Check price