How to Properly Wash a Mattress Cover

Your mattress cover works harder than any other layer on your bed. It catches sweat, dead skin, dust mites, and spills so your mattress stays clean — but that also means it gets dirty fast. The good news: washing a mattress cover is simple once you understand the fabric. Most covers can go in the washing machine on a gentle cycle with cold or warm water, then air-dry or tumble on low heat. The catch is that the details vary by material, and getting them wrong can ruin the cover or, worse, compromise its protective function.

Before doing anything else, check the care tag. That label is the most reliable guide for your specific product. If it says “dry clean only,” respect that. If it says “machine wash cold,” you’re clear to proceed. This guide walks through the entire process — from pre-treatment to drying — plus how to handle waterproof covers, cotton covers, and the mistakes that ruin them.

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Why Regular Washing Matters (And Why Aggressive Washing Backfires)

Most people wash sheets weekly but leave the mattress cover for months. That’s a missed opportunity. Dust mites and their waste products are a leading trigger for indoor allergies, according to the American Academy of Allergy, Asthma & Immunology. Your mattress cover is the frontline defense against these microscopic pests. When it goes unwashed, the allergen load in your bed climbs steadily.

Here’s the counter-intuitive angle most cleaning guides skip: washing your mattress cover too aggressively can actually make your bed dirtier over time. Here’s why. If you use hot water and harsh detergent on a waterproof cover, you can degrade the polyurethane or TPU (thermoplastic polyurethane) membrane. Once that membrane cracks or peels, moisture seeps straight into the mattress. You won’t see the damage until you notice a musty smell or a dark stain — and by then, you’re dealing with a much bigger problem than a dirty cover. The goal isn’t just to clean the cover; it’s to preserve its protective function.

A practical schedule: wash your mattress cover every 1–2 months, or immediately after any visible stain, spill, or illness. If pets sleep on the bed, bump that up to every 2–3 weeks. The same logic applies if you sweat heavily at night. Your cover is doing a dirty job; return the favor by cleaning it on a routine.

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Before You Start: 60-Second Checks

Take a minute to run through these checks before touching the washing machine. Skipping any of them can lead to a ruined cover or a wasted wash cycle.

Read the care label first. This is non-negotiable. The label tells you water temperature, cycle type, drying method, and restrictions like “no bleach” or “no fabric softener.” If the label is missing or faded, default to cold water and a gentle cycle — the safest combination for almost any fabric.

Inspect for stains and damage. Look for discoloration, tears, or worn spots. Stains need pre-treatment before washing. Damage might mean the cover needs replacing rather than washing.

Check the closure. If your cover has a zipper, close it fully before washing. An open zipper can snag on other items or catch on the washer drum. If the zipper is broken or stuck, fix it before washing — a loose zipper pull can scratch the drum.

Confirm your washer settings. Know which cycle you’ll use before you load the machine. Gentle or delicate is the default for most covers. If your machine has an extra rinse option, plan to use it.

Decide on the drying method. Choose ahead of time whether you’ll air dry or machine dry. This prevents the temptation to “just throw it in the dryer on high” when you’re in a hurry.

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Step-by-Step: How to Wash a Mattress Cover

Now for the actual process. Follow these steps in order, and you’ll avoid the most common mistakes — like shrinking a cotton cover or melting a waterproof membrane.

Step 1: Strip the Bed and Pre-Treat Stains

Remove all sheets, pillowcases, and any toppers. Unzip or peel the mattress cover off the mattress. Give it a quick once-over for stains, tears, or worn spots. If you find a stain, pre-treat it before washing. A mixture of one part white vinegar to three parts cold water works well for most organic stains like sweat or urine. For oil-based stains, apply a drop of dish soap directly to the spot and gently rub it in. Let the pre-treatment sit for 10–15 minutes before washing.

Step 2: Choose Your Detergent and Settings

Use a mild, liquid detergent. Avoid bleach, fabric softeners, and dryer sheets. Fabric softener is particularly problematic for waterproof covers because the waxy residue it leaves behind can clog the membrane’s pores, reducing breathability and water resistance. If you want a scent boost, add a few drops of essential oil to the rinse cycle — but skip it if you have sensitive skin.

Set your machine to the gentle or delicate cycle with cold or warm water. If your machine has an extra rinse option, use it. This ensures all detergent is fully flushed out. Residual detergent can irritate skin and attract dirt faster.

Step 3: Load the Washer Properly

Load the cover into the machine by itself or with a few towels of a similar color. Avoid washing it with items that have zippers, hooks, or rough textures — those can snag and tear the fabric. A mattress cover needs room to move in the washer. If you stuff it in with a full load of towels and sheets, it won’t get properly cleaned, and the friction can cause pilling or tears.

Step 4: Dry With Care

Here’s the critical rule: air dry whenever possible. Hang the cover over a shower rod, a clothesline, or a drying rack. If you must use a dryer, set it to the lowest heat setting and check it frequently. High heat can shrink cotton covers and warp waterproof membranes. Remove the cover from the dryer while it’s still slightly damp and let it finish air-drying. This reduces the risk of over-drying and makes the cover easier to put back on the mattress.

Step 5: Check the Results

After drying, inspect the cover before putting it back on the mattress. Check for any remaining stains, signs of damage, or — for waterproof covers — delamination (bubbling or peeling of the backing). If the cover is clean and intact, you’re done. If stains remain, repeat the pre-treatment and wash process. If the cover is damaged, it’s time to consider replacement.

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How to Wash Different Types of Mattress Covers

Not all mattress covers are created equal. Here’s how to handle the most common types you’ll encounter.

Waterproof Mattress Covers

Waterproof covers have a laminated backing — usually polyurethane, TPU, or vinyl. The outer layer is often cotton or polyester, but the waterproof layer is what needs special care.

• Wash in cold or warm water only. Hot water can degrade the waterproof membrane.
• Skip the fabric softener and bleach entirely. Both can damage the laminate.
• Air dry flat or hang dry. If you use a dryer, use the no-heat or air-fluff setting. High heat will cause the membrane to crack and peel.
• Check for delamination after drying. If you see bubbles, peeling, or flaking on the backing, the cover is compromised and needs replacing.

Cotton Mattress Covers

Cotton is the most forgiving fabric. It can handle warmer water and more aggressive washing, but that doesn’t mean you should push it.

• Wash in warm water with a gentle detergent.
• You can use the dryer on low or medium heat, but cotton shrinks — so if you want to be safe, air dry.
• Treat stains with a vinegar solution before washing.

Memory Foam Mattress Toppers

Wait — a memory foam topper is not the same as a mattress cover. If you’re dealing with a foam topper, you should never put it in the washing machine. The agitation will break down the foam structure. Instead, spot-clean it with a damp cloth and a mild detergent, then let it air dry completely. If your topper has a removable, washable cover, wash that cover separately following the care label instructions.

Silk or Wool Covers

These are luxury fabrics that demand gentle handling. Silk covers should be hand-washed in cold water with a silk-specific detergent, or dry cleaned. Wool covers should be washed in cold water on the wool cycle if your machine has one — or hand-washed. Never wring them out; press the water out gently with a towel. For more detailed guidance on wool care, check out this resource on how to wash care wool cashmere items properly.

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Common Mistakes That Ruin Mattress Covers

You’ve probably heard the advice “just throw it in the wash.” That works for some covers, but it can destroy others. Here are the most common pitfalls — and how to avoid them.

Using Hot Water on Waterproof Covers

Hot water is the fastest way to ruin a waterproof mattress cover. The heat breaks down the polyurethane or TPU membrane, causing it to peel, crack, or become brittle. Once that happens, the cover is no longer waterproof, and you’re back to square one. Always use cold or warm water for waterproof covers.

Drying on High Heat

High heat in the dryer is a close second. It can shrink cotton covers, melt synthetic fibers, and warp waterproof laminates. If you’re in a hurry, use the air-fluff or no-heat setting. Better yet, hang the cover to dry overnight. It’s not worth the risk of a ruined cover to save 30 minutes.

Overloading the Washer

A mattress cover needs room to move in the washer. If you stuff it in with a full load of towels and sheets, it won’t get properly cleaned, and the friction can cause pilling or tears. Wash it alone or with just a couple of lightweight items.

Using Fabric Softener

Fabric softener is bad news for almost all mattress covers. It leaves a residue that reduces absorbency, traps odors, and can clog the pores of waterproof membranes. If you want softness, use a half-cup of white vinegar in the rinse cycle instead — it naturally softens fabric without the residue.

Skipping the Pre-Treatment

Stains that go into the washer often come out as permanent marks. Pre-treating stains before washing is the difference between a clean cover and a stained one. It takes two minutes and saves you from frustration later.

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Quick Decision Aid: Is Your Cover Ready for the Wash?

Run through these five checks before you start. Each one is a simple pass/fail test.

• Care label readable and followed? If the label is missing, you’re defaulting to cold water and gentle cycle. If the label says “dry clean only,” you’re not machine washing.
• Stains pre-treated? Visible spots got a vinegar or dish soap treatment and sat for at least 10 minutes.
• Zipper closed? The zipper is fully closed, and the pull is secure.
• Washer not overloaded? The cover has room to move, and there are no rough items (zippers, hooks) in the load.
• Drying method decided? You know whether you’re air drying or using the no-heat dryer setting before you start.

If you passed all five checks, proceed with confidence. If you failed any, fix it before starting — it’s easier than dealing with a ruined cover.

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When to Stop DIY and Replace the Cover

Even with perfect care, mattress covers don’t last forever. Here are the signs that it’s time to buy a new one:

• Visible wear: Holes, tears, or frayed edges that can’t be repaired.
• Loss of waterproofing: If water soaks through the cover, the membrane has failed.
• Persistent odor: If washing doesn’t remove the smell, the cover has absorbed too much over time.
• Stains that won’t come out: Some stains are permanent, especially if they’ve set in over multiple washes.
• Loose elastic or broken zippers: If the cover no longer fits snugly, it’s not doing its job.

A good mattress cover should last 2–3 years with regular washing. If you’re replacing yours, look for one with a removable, machine-washable design — it’ll be easier to maintain than a one-piece cover.

Stop threshold: If you notice delamination (bubbling or peeling of the waterproof backing), a torn seam, or a persistent musty odor after two full wash-and-dry cycles, stop washing and replace the cover. No amount of cleaning will restore a compromised membrane or a broken seal. Continuing to use a damaged cover puts your mattress at risk of moisture damage — which is a far costlier problem than a new cover.

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Frequently Asked Questions

Can I wash a mattress cover with my regular laundry?

You can, but it’s not ideal. Washing a mattress cover with items that have zippers, hooks, or rough textures can cause snags and tears. If you do combine loads, keep the cover with soft, similar-colored items like sheets or t-shirts, and use the gentle cycle.

How often should I wash my mattress cover?

Aim for every 1–2 months as a baseline. Wash more frequently — every 2–3 weeks — if you have pets on the bed, sweat heavily, or have allergies. Wash immediately after any spill, illness, or visible stain.

Can I put a waterproof mattress cover in the dryer?

Yes, but only on the no-heat or air-fluff setting. High heat will damage the waterproof membrane. Air drying is always the safer choice.

What happens if I use bleach on a mattress cover?

Bleach can weaken fibers, discolor fabrics, and damage waterproof membranes. It’s best to avoid bleach entirely. If you need to whiten a cotton cover, use oxygen-based bleach (like OxiClean) instead — but test it on a small, hidden area first.

My mattress cover says “dry clean only.” Can I still machine wash it?

Follow the care label. “Dry clean only” means the manufacturer has determined that machine washing could damage the fabric or construction. In this case, take it to a professional cleaner or spot-clean it by hand.

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Final Thoughts on Washing Your Mattress Cover

Washing a mattress cover isn’t complicated, but it does require attention to material and care labels. The most important rules to remember: use cold or warm water, skip the fabric softener, air dry whenever possible, and never use high heat on waterproof covers. If you follow those guidelines, your cover will stay clean, functional, and protective for years.

If you’re dealing with a mattress issue beyond a dirty cover — like mold or stubborn stains — you’ll want to address those separately. Check out this guide on how to remove mold from mattress surfaces, and this one on how to remove mattress stains effectively. And if you have pets sharing your bed, don’t forget to wash their bedding on a regular schedule too — you can learn how to wash pet bedding properly here.

Now that you know the process, set a reminder on your phone for the first of next month. Take the cover off, check the label, and give it a proper wash. Your mattress — and your nose — will thank you.

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