How to Clean a Cooling Pillow | Two Methods That Protect Your Warranty

One wrong move — a spin cycle on a gel-filled core, a twist to get the water out — and the cooling layer that cost you a good night’s sleep turns into a lumpy mess. The damage is permanent, and it usually voids the warranty. The fix is knowing which part of your pillow gets the machine and which part gets the sink, with a drying step that stops mold before it starts.

Read the Tag First — Different Cores Need Different Care

Cooling pillows use one of three internal materials, and each one has a different tolerance for water and heat. Wash the wrong one in the machine and the core crumbles; dry the wrong one on high and the gel layer melts.

Check your pillow’s tag or the brand’s care page before you start. If the tag says “not washable” — as Tempur-Pedic memory foam pillows do — skip the sink entirely and spot-clean only.

Which Washing Method Does Your Pillow Need?

The cover and the core get different treatments. Separating them first is the single mistake that causes most ruined pillows.

Machine Wash the Removable Cover

Unzip the cover and wash it alone or with similar colors. Use a front-loading washer if possible — top-loaders with a center agitator can stretch the fabric.

• Cycle: Gentle or delicate.
• Water temp: Cold or cool, never hot.
• Detergent: Mild, pH-neutral. No bleach, no fabric softener.
• Balance load: Add a couple of towels so the washer doesn’t throw itself off balance.
• Dry: Tumble dry low with dryer balls to keep the cover fluffy.

Hand Wash the Cooling Core (Most Pillows)

Unless your brand table above says machine wash is safe for the core, assume hand wash only. Memory foam, gel layers, and SmartGRID all go into the sink.

1. Fill a clean basin with cool or lukewarm water. Add about one tablespoon of mild liquid detergent per gallon of water.
2. Submerge the pillow core and gently squeeze and massage the lather into the foam. The Sleep Foundation’s guide and Puffy both stress this step: no aggressive scrubbing, no twisting, no wringing.
3. Drain the soapy water and refill with clean cool water. Keep squeezing gently until the water runs clear and all the soap is out.
4. Press the water out by laying the pillow flat on a clean towel and rolling it up like a jelly roll, pressing gently. Purple’s care page warns explicitly: do not twist or wring the foam.
5. Air dry flat on a ventilated surface — a drying rack works well — away from direct sunlight and any heat source. Give it at least 24 hours. The core must be bone-dry inside; any trapped moisture leads to mold.

Spot Clean When a Full Wash Isn’t Needed

A single stain or spot doesn’t require an all-day hand-wash session. Blot the stain with a clean white cloth dipped in a mix of mild detergent and cool water, working from the edges inward. Never rub — that spreads the stain and pushes it deeper into the foam. Dab again with a cloth dipped in plain water to remove any soap residue, then let the spot air dry completely before you put the cover back on.

The spot-clean method is also the only safe option for pillows the manufacturer says are not washable at all, like Tempur-Pedic and some SmartGRID models.

Common Mistakes That Ruin a Cooling Pillow

These errors show up on every brand’s troubleshooting page and in the longest-running forum threads on pillow care. Avoid them and the pillow lasts years instead of months.

• Running the core through the washing machine. Memory foam and gel cores absorb water like a sponge and never fully dry inside. The material breaks down and clumps.
• Wringing water out of the foam. Twisting tears the internal structure. Squeeze gently or press in a towel.
• Drying on high heat. Heat ruins the cooling gel’s phase-change properties. Use low heat for covers only; air dry all cores.
• Using bleach or chlorine. These materials dissolve or discolor the foam. pH-neutral detergents only.
• Skipping the full 24-hour dry. A slightly damp core grows mold in the dark inside a pillowcase. Dry until there is zero moisture feel.

If you are shopping for a new cooling pillow and sweat or overheating is the reason you care about cleaning in the first place, our tested picks for the best cooling pillows for night sweats are worth a look before you buy.

Maintenance Schedule — How Often to Clean

Puffy’s care guide and the Sleep Foundation agree on timing. The removable cover goes in the wash every two weeks — the same schedule as your sheets. A full core wash happens every three to six months, depending on whether you use a pillow protector. Spot clean any spill or stain as soon as it happens; don’t let it set.

Plan it for a morning when you can leave the pillow out overnight and won’t need it back on the bed until the following evening.