How to wash a waterproof mattress protector?

A waterproof mattress protector is washed on a gentle machine cycle in cool or warm water with mild detergent, then air dried or tumbled on low heat, which cleans the fabric without cracking the waterproof membrane.

The waterproof layer on a mattress protector is usually a thin polyurethane film bonded to the top fabric, and heat, bleach, and fabric softener are what break it down. Gentle agitation and low heat keep that backing intact, so the protector keeps blocking spills and sweat from reaching the mattress, including foam and hybrid constructions.

Waterproof mattress protectors typically use a polyurethane film backing bonded to a cotton, polyester, or terry top layer.
Hot water, high dryer heat, and bleach are the three most common causes of a cracked waterproof membrane.
Fabric softener coats the protector's surface and can reduce its breathability and waterproof performance over repeated washes.
Mattress protectors are machine-washed on a gentle or delicate cycle, not a heavy-duty or sanitize setting.
Tumble drying a waterproof mattress protector calls for the lowest heat setting; air drying is the safer option.

01Step-by-Step

Check the care label: Read the tag sewn into the waterproof mattress protector for its maximum water temperature and drying instructions before you start, since the label overrides general guidance.
Shake and spot-treat: Take the protector outside or over a bin and shake off loose debris, then dab any stains with mild detergent and cool water on a soft cloth.
Load it alone or with light items: Wash the waterproof mattress protector by itself or with soft sheets so it has room to move and isn't dragged against zippers or heavy fabrics.
Set a gentle cycle: Choose the delicate or gentle setting with cool or warm water, and use a small measure of mild liquid detergent without bleach or fabric softener.
Add an extra rinse: Run a second rinse so no detergent film stays on the polyurethane backing, because leftover soap can leave the surface stiff and sticky.
Dry on low or hang it: Tumble the waterproof mattress protector on the lowest heat setting until just dry, or hang it flat over a rack or line to air dry fully.
Inspect before remaking the bed: Hold the dry protector up to the light and check the backing for cracks, peeling, or stiff patches before fitting it back on the mattress.