How To Wash a Mattress Cover: Simple Steps for a Fresher Bed

If you’re wondering how to wash a mattress cover without shrinking it, damaging the fabric, or voiding a warranty, you’re in the right place. This FAQ-style guide walks through when and how to clean a mattress cover, what settings to use, and common mistakes to avoid.

What exactly is a mattress cover?

A mattress cover (sometimes called a protector or encasement) is a removable layer that fits over your mattress. It’s there to:

  • Protect against spills and everyday wear
  • Keep dust and debris off the mattress surface
  • Provide a removable layer that’s easier to clean than the mattress itself

Because mattress covers sit between you and the mattress, regular washing helps keep your sleep surface fresher and more comfortable.

How often should I wash a mattress cover?

How often you should wash a mattress cover depends on how you use it:

  • Every 1–2 months for general use
  • More often if there are spills, sweat, or if you eat in bed
  • Immediately after any noticeable stain or accident

If you use a top sheet and wash your bedding regularly, you may not need to wash the cover as frequently. However, spot-cleaning spills right away helps prevent permanent stains and odors.

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

Always start by checking the care label attached to your mattress cover. When in doubt, follow the label over any general advice.

1. Remove the cover and inspect it

Unzip or remove the cover carefully so you don’t tear seams or snag zippers. Check for:

  • Stains that may need pre-treatment
  • Tears or loose stitching
  • Any special care instructions printed on tags

2. Treat stains before washing

For visible stains, gently pre-treat the area:

  • Blot (don’t rub) fresh spills with a clean cloth or paper towel
  • Apply a small amount of mild liquid detergent or a gentle stain remover
  • Let it sit for a few minutes, then rinse lightly with cool water if recommended

Avoid using harsh bleach or strong chemicals unless the label clearly says they are safe. These can weaken fabrics or damage waterproof membranes.

3. Choose the right machine settings

Most fabric covers can go in a household washer, but the settings matter:

  • Water temperature: Cool or warm is usually safest
  • Cycle: Gentle or delicate to reduce wear and tear
  • Detergent: Mild, without added bleach or heavy fragrances

If your cover has a waterproof backing, hot water or harsh spin cycles may crack or peel that layer over time, so gentler settings are often best.

4. Don’t overload the washer

Give the mattress cover enough room to move freely in the drum. Overloading can lead to:

  • Incomplete cleaning
  • Tangling and stretching
  • Extra stress on seams and zippers

If your cover is thick or king-sized, using a larger-capacity machine can help protect it.

5. Dry the mattress cover carefully

Drying is where many covers get damaged. To be safe:

  • Use low heat or air-dry in the dryer if allowed on the care tag
  • Add a few clean towels to balance the load and reduce wrinkling
  • Check partway through to ensure it’s not overheating

If the label says line dry or air dry only, lay the cover flat or hang it evenly to avoid stretching. High heat can shrink fabrics or cause waterproof layers to bubble or crack.

Can every mattress cover go in the washing machine?

Not necessarily. Some covers are:

  • Dry-clean only
  • Spot-clean only
  • Designed with foam or padding inside that shouldn’t be fully submerged

If your cover feels heavy, quilted, or has unusual materials, read the tag closely. Washing something that’s meant only for spot-cleaning can result in clumping, damage, or a poor fit on your mattress afterward.

What if my mattress cover is waterproof or has a special coating?

Waterproof mattress covers usually have a thin protective layer on the underside. To help preserve it:

  • Avoid high heat in both washing and drying
  • Use gentle cycles and mild detergent
  • Skip fabric softener if the label advises against it (it can sometimes affect breathability or coating performance)

Over time, some wear is normal, but treating the cover gently can help it stay effective longer.

Is it okay to use bleach or strong cleaners?

Bleach and strong chemicals can:

  • Weaken fibers
  • Discolor fabrics
  • Damage waterproof membranes

Unless your care label specifically says bleach is safe, stick to mild detergent and gentle stain removers. For odors, an extra rinse cycle with plain water often helps.

How should I put the mattress cover back on?

Once your mattress cover is completely dry:

  1. Check for any damp spots, especially in seams or corners.
  2. Fit one end over the top or bottom of the mattress.
  3. Work your way around, smoothing wrinkles as you go.
  4. Zip or fasten it gently to avoid straining the zipper.

Putting it on while even slightly damp can trap moisture, which is best avoided.

✅ Quick Mattress Takeaways

Key points consumers should understand about How To Wash a Mattress Cover

  • Always read the care label first and follow those instructions over general tips.
  • Wash every 1–2 months, or sooner after spills, stains, or heavy use.
  • Pre-treat stains gently before putting the cover in the washer.
  • Use cool or warm water, a gentle cycle, and mild detergent.
  • Avoid high heat when drying, especially with waterproof covers.
  • Don’t overload your machine; large covers may need a bigger-capacity washer.
  • Make sure the cover is fully dry before putting it back on the mattress.

Understanding how to wash a mattress cover properly helps keep your sleep surface cleaner and protects your mattress over time. With the right settings, gentle products, and a little attention to the care label, washing your cover can be a straightforward part of regular mattress care.