Does Laundry Detergent Kill Bed Bugs? What Actually Works in the Wash?

Detergent alone does not reliably kill bed bugs — the heat of a 30-minute high-heat dryer cycle is what actually destroys them and their eggs.

A bed bug hiding in a folded pillowcase doesn’t care how much soap you add. It cares about temperature. The EPA states plainly that washing alone generally will not kill bed bugs, and that guidance flips the whole chore on its head: the dryer, not the washer, is the workhorse. Get the heat right and you remove live bugs and eggs from fabric in about half an hour. Get it wrong, and you’ve simply given the bugs a bath.

Below is what the research actually supports, the exact order to handle infested laundry, and the mistakes that let bugs survive the wash.

Does Washing With Detergent Kill Bed Bugs?

Washing with detergent can kill some bed bugs, but it is not dependable on its own — heat is the reliable killer, and it happens in the dryer. Detergent loosens soil and helps water penetrate fabric, yet the EPA is clear that a normal wash is not a treatment.

What the numbers say:

• The EPA’s standard for bedding and clothing is a high-heat dryer run of 30 minutes.

In practice, run the hottest water the fabric can tolerate, then finish in the dryer on high. The wash helps; the heat does the killing. Cold water and a low dryer setting are the two fastest ways to send live bugs back into your bedroom.

How Should You Handle Infested Laundry Step By Step?

The order of operations matters as much as the temperature, because bugs escape between the bed and the machine if you carry laundry loose. Bag it first, wash and dry hot, then seal the clean items away from the infested room.

1. In the infested room, sort laundry and seal each load into a separate plastic bag before moving anything. This keeps bugs contained during transport.
2. Carry the sealed bags straight to the washer or dryer — no stopping in hallways, and no bags parked in bedrooms or hampers.
3. Empty each bag directly into the machine. Fold the empty bag into another sealed bag before you throw it out.
4. Wash with detergent on the hottest setting the care label allows.
5. Dry on the hottest safe setting. The EPA calls for 30 minutes; Purdue Extension suggests 20–45 minutes after washing.
6. Load the dryer loosely. Packed-tight items block lethal heat from reaching every surface, which is a top reason bugs survive the cycle.
7. Bag the clean, dry items immediately and keep them sealed until the infestation is under control.
8. Clean or treat the hamper itself — bugs and eggs hide in the seams.

You’ll know the load is done when items come out hot to the touch and fully dry; a cool or damp center means the cycle didn’t reach temperature throughout. Laundering removes bugs from fabric, but it does not touch the mattress, bed frame, or cracks nearby, so treat it as one part of the plan rather than the whole solution.

What About Dry-Clean-Only, Shoes, and Stuffed Animals?

Many items that can’t be washed can still be dried — a 30-minute medium-high to high dryer run kills bed bugs on dry-clean-only clothing, shoes, bags, stuffed animals, and curtains, as long as the material tolerates the heat.

Check the care label first, and watch for heat-sensitive parts: adhesives, rubber, plastics, and delicate synthetics can warp or melt. If a label forbids machine drying, don’t override it — that item needs professional heat treatment, steam, freezing, or a pest-management professional. The EPA notes that infested articles and areas can be heated to at least 120°F for 90 minutes to kill eggs, but that’s controlled commercial treatment, not something to improvise with a space heater at home.

If you’re restocking supplies and want to know which detergents handle the wash cycle best, a tested roundup of laundry detergent options for bed bug loads covers the practical picks — though remember that no detergent brand replaces the heat step.

What Are the Most Common Mistakes?

The same handful of errors show up again and again, and each one leaves live bugs behind. Avoiding them is often the difference between a resolved problem and a repeat infestation.

• Trusting soap over heat. Detergent and a normal wash cycle are not a treatment on their own.
• Going cold. Cold-water washing and low-heat drying may not kill bed bugs at all.
• Stuffing the dryer. Penn State recommends loading items loosely so heat Circulates to every surface.
• Carrying laundry loose. Unbagged linens spread bugs through the house.
• Returning clean items too soon. Putting them back in an untreated room or hamper undoes the work.
• Stopping at the laundry. Mattresses, frames, and furniture can harbor bugs that the washer never reaches.

The EPA recommends integrated pest management for a reason: laundry handles what’s in the fabric, and the room needs its own treatment. For the full method behind the 30-minute rule and heat treatment guidance, the EPA’s bed bug IPM guidance is the reference authority.