Why Your Mattress Deserves a Proper Deep Clean

You spend around a third of your life on your mattress, and in that time it quietly collects a surprising amount: dead skin cells, sweat, dust mite droppings, pet hair and the odd crumb from a late-night biscuit. None of that means your bed is unclean, but over months it does build up, and it can leave you waking with a stuffy nose, itchy eyes or a bedroom that never quite smells fresh.

The good news is that you don't need specialist equipment or a professional service. A decent vacuum, a box of bicarbonate of soda and a couple of hours of your time will transform a tired mattress. It's one of those jobs that feels like a chore until you see the results, and then it becomes oddly satisfying.

What You'll Need

Gather everything before you start, so you're not dashing to the cupboard mid-job with a dusting of powder all over the landing carpet.

• A vacuum cleaner with an upholstery attachment (a nozzle tool works if you don't have one)
• A generous tub of bicarbonate of soda — around 200g for a double mattress
• A clean, dry cloth or two, plus a spray bottle of cool water
• A small amount of mild washing-up liquid for stains
• Optional: a few drops of lavender or eucalyptus oil to scent the powder
• Fresh bedding, and ideally a washable mattress protector

Open the bedroom windows before you begin. Airflow is your friend here, and it makes the whole process quicker.

Step One: Strip the Bed and Vacuum Both Sides

Pull off all the bedding and put it straight in the wash — bed linen should be washed at 60°C where the care label allows, which is hot enough to deal with dust mites. While that's going, turn your attention to the mattress itself.

Start with the top surface, working in slow, overlapping strips rather than quick sweeps. Pay particular attention to the seams, the piped edges and any quilting or tufting, because that's where dust and skin cells collect. If your mattress has a removable cover, check whether it can be unzipped and washed separately.

Now flip the mattress — ask someone to help, as even a double can be awkward — and vacuum the underside just as thoroughly. If your mattress is single-sided (many modern memory foam and pocket sprung models are), rotate it head to toe instead and do the same on the base or divan. Vacuum the bed base and the slats too; there's no point cleaning one side of the equation.

Step Two: The Bicarbonate of Soda Treatment

Once the vacuuming is done, sprinkle a fine, even layer of bicarbonate of soda across the whole sleeping surface. You're aiming for a light dusting like icing sugar, not a thick crust. Use a sieve or a flour shaker if you have one — it spreads far more evenly than shaking the tub.

If you fancy a bit of fragrance, add three or four drops of essential oil to the bicarbonate before you sprinkle it, mixing it through in a bowl first. Let it sit for at least an hour, and longer if you can manage it — two hours is even better. The powder draws out moisture and neutralises the acids in sweat that cause that lingering stale smell.

While it works its magic, this is a good moment to clean the bedroom itself: dust the skirting boards, wipe down the bedside tables and give the carpet a quick pass with the vacuum.

Step Three: Vacuum Again and Deal with Stains

After an hour or so, vacuum the powder away using the same upholstery attachment. Go over the surface twice — once with the attachment, once with the bare nozzle if your vacuum has one — to make sure no residue is left behind.

If you've spotted any marks, treat them now:

• Sweat and general marks: dab with a cloth wrung out in cool water and a drop of washing-up liquid. Blot, don't rub.
• Blood: cold water only. Warm water sets the stain and makes it far harder to shift.
• Urine or pet accidents: blot thoroughly, then treat with a dedicated enzyme cleaner and allow it to dry completely.
• Coffee or tea: blot immediately, then use a weak solution of cool water and mild soap, working from the outside of the stain inwards.

Whatever you use, keep the moisture to a minimum. A damp mattress is a mouldy mattress, so blot dry with a clean towel afterwards.

Step Four: Air Everything Before You Make the Bed

Leave the mattress to air for a few hours, with the windows open and the duvet pulled back. If the weather is dry and warm, propping the mattress upright against a wall by an open window speeds things up beautifully. In winter, a dehumidifier in the room does the job just as well.

Only make the bed once the surface feels completely dry to the touch — not just cool, genuinely dry. Then add a washable mattress protector, which will catch most of the sweat and spills between deep cleans and can go through the machine every month.

Aim to repeat this whole routine every three to four months, and always at the change of seasons when you swap the winter duvet for the summer one. It takes an afternoon, costs very little, and you'll notice the difference the moment you climb into bed.