How often to wash your mattress protector, the safest wash and dry settings for waterproof and cotton styles, and mistakes that shorten its life.
A mattress protector only does its job - blocking spills, sweat, allergens, and dust mites from reaching your mattress - if you actually keep it clean. But protectors are also easy to damage in the wash if you use the wrong settings, especially waterproof styles with a laminated backing. Here's how to wash one correctly, how often you actually need to, and how to avoid the mistakes that break down the waterproof layer early.
Most manufacturers recommend washing a mattress protector every one to two months under normal use, and immediately after any spill or accident. If you have allergies, asthma, pets that sleep on the bed, or you're prone to night sweats, washing closer to once a month keeps allergens and odor from building up underneath your sheets where you won't notice them.
Cotton, bamboo, and quilted protectors without a waterproof membrane are usually the most forgiving - most can go straight into the washing machine. Always check the tag, since fill type and construction vary by brand.
Use a mild detergent and skip fabric softener, which coats fibers and reduces how well the protector breathes. Wash separately or with similarly weighted items so it doesn't get twisted or overloaded in the drum.
Tumble dry on low, or hang to air dry if the protector has any elastic or fitted skirt, since high heat weakens elastic over time.
Waterproof protectors have a thin membrane - usually polyurethane or vinyl - bonded to the fabric, and this layer is what actually fails first if it's mistreated. To protect it:
Hot water breaks down the waterproof backing and can cause it to crack, peel, or go tacky over time.
Tumble dry on low or no-heat/air-only, or line dry indoors out of direct sun. High heat is the single most common reason a waterproof protector stops being waterproof.
Both degrade the waterproof layer. A mild, unscented detergent is all a waterproof protector needs.
Zippers, buttons, or anything abrasive can puncture or scratch the waterproof coating during the spin cycle.
A lingering odor after washing usually means detergent residue or trapped moisture rather than a dirty protector. Try an extra rinse cycle with no detergent, and make sure the protector is completely dry - bone dry, not just dry to the touch - before putting it back on the bed. Storing a protector while it's even slightly damp is one of the most common causes of a musty smell that keeps coming back.
If a waterproof protector no longer beads water on the surface, feels tacky or sticky, or has visible cracking in the coating, washing won't restore it - the membrane has broken down and it's no longer protecting your mattress. At that point, it's doing more harm than good, since a compromised protector traps moisture against the mattress instead of blocking it.
A mattress protector is one of the simplest ways to make a mattress last, and it's also one of the few maintenance habits that directly affects your comfort warranty coverage. If you're shopping for a new one, our five LA-area showrooms carry protectors sized for every mattress we sell, and every mattress purchase online or in-store is backed by our free 120-night comfort guarantee.
Check the care label, then wash on a gentle cycle with cold or lukewarm water and a mild detergent, avoiding bleach and fabric softener. Dry on low heat or air dry, especially for waterproof styles, since high heat damages the waterproof backing.
Yes - nearly all mattress protectors are machine washable, including waterproof styles, as long as you use cold or lukewarm water and low heat when drying. Always check the specific care instructions on the tag first, since fill and membrane types vary.
Every one to two months for most households, or monthly if you have allergies, pets on the bed, or night sweats. Wash immediately after any spill or accident rather than waiting for a scheduled cleaning.
Not necessarily - a protector alone is enough to guard against spills, dust mites, and allergens. A mattress pad adds extra cushioning and a softer feel on top of that protection, so it comes down to whether you want more comfort layered on, not whether it's required.
Wash it alone in cold or lukewarm water with a mild detergent, skip bleach and fabric softener, and dry on low heat or air-only. This keeps the waterproof membrane intact instead of breaking it down with heat.
Ready to protect a new mattress from day one? Explore our mattress toppers and protective bedding or take our two-minute sleep quiz to find the right fit for your bed.
Related reading: Do You Need a Mattress Protector? Honest Answer + What to Look For and Mattress Protector vs Mattress Pad: What's the Difference?.
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