How to Wash Mattress Protectors: Complete UK Care Guide 2026
A good mattress protector is one of the best investments you can make for your bed — but only if you wash it correctly. Wash it wrong and you risk shrinkage, loss of waterproofing, and a lumpy, misshapen protector that no longer does its job. This complete UK care guide covers everything you need to know about washing, drying, and maintaining your mattress protector in 2026.
How Often Should You Wash a Mattress Protector?
As a general rule, wash your mattress protector every 1–2 months under normal use. However, you should wash it more frequently if:
- You sweat heavily during the night
- You have allergies or asthma — see our guide on mattress protectors for allergies
- You have young children or pets sharing the bed
- There has been a spill or accident
- You use a waterproof pillow protector — these should also be washed monthly
Step-by-Step: How to Wash a Mattress Protector
Step 1: Check the Care Label
Always check the label first. Most UK mattress protectors — including our soft luxury quilted mattress protector and waterproof breathable protector — are machine washable at 40°C or 60°C. Never ignore the care label as high temperatures can damage waterproof membranes.
Step 2: Pre-Treat Any Stains
For stains, apply a small amount of mild liquid detergent directly to the affected area and gently work it in with a soft cloth. Leave for 10–15 minutes before washing. Avoid bleach as it can break down waterproof coatings and damage fibres.
Step 3: Machine Wash on the Right Setting
- Temperature: 40°C for regular washes; 60°C for a hygiene wash (check label first)
- Spin speed: 800–1000 RPM — avoid high spin speeds which can damage the waterproof layer
- Detergent: Use a mild, non-biological liquid detergent — avoid fabric softener as it clogs the waterproof membrane
- Load size: Wash alone or with similar items — don't overload the drum
Step 4: Rinse Thoroughly
Run an extra rinse cycle if your machine allows it. Detergent residue left in the protector can reduce its breathability and waterproofing over time.
Step 5: Dry Correctly
This is where most people go wrong. Always:
- Tumble dry on low heat if the label permits — high heat damages waterproof membranes
- Air dry flat if possible — lay it on a clean surface or hang over a clothes airer
- Never dry in direct sunlight for extended periods as UV can degrade fibres
- Make sure it is completely dry before putting it back on the mattress — a damp protector can cause mould
Can You Tumble Dry a Mattress Protector?
Yes, most mattress protectors can be tumble dried — but always on a low heat setting. High heat is the number one cause of waterproof membrane damage and shrinkage. If in doubt, air dry instead.
How to Wash Different Types of Mattress Protectors
Waterproof Mattress Protectors
Our waterproof mattress protectors and terry towelling waterproof protectors have a special membrane that repels liquid. To preserve this:
- Never use fabric softener
- Wash at 40–60°C maximum
- Tumble dry on low or air dry
- Re-test waterproofing after washing by dripping a few drops of water on the surface — they should bead up
Quilted Mattress Protectors
Quilted protectors like our soft luxury quilted mattress protector can be washed at 40°C. Shake well after washing to redistribute the filling evenly before drying.
Fleece & Thermal Protectors
Our thermal fleece underblanket should be washed at 40°C on a gentle cycle. Tumble dry on low and give it a good shake to restore the fleece texture.
Common Mistakes to Avoid
- ❌ Using fabric softener — blocks the waterproof membrane
- ❌ Washing at too high a temperature — causes shrinkage and membrane damage
- ❌ High spin speeds — can distort the shape and damage stitching
- ❌ Putting it back damp — leads to mould and mildew on your mattress
- ❌ Washing too rarely — dust mites and allergens build up quickly
How to Know When to Replace Your Mattress Protector
Even with perfect care, mattress protectors don't last forever. Replace yours if:
- The waterproofing no longer works (water soaks through rather than beading)
- It has permanent stains or odours that won't wash out
- The filling has become lumpy or uneven
- The elastic has lost its stretch and it no longer fits snugly
When it's time for a new one, browse our full range of mattress protectors — all designed for easy care and long-lasting performance.