How to Clean a CPAP Machine, Mask and Hose: Two Minutes a Day
How to Clean a CPAP Machine, Mask and Hose: Two Minutes a Day
Washing-up liquid is the wrong product. Vinegar is the right one, but only for one job. And the sanitiser you were about to buy may void your warranty. Here's the routine that actually keeps equipment going.
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Cleaning isn't about germs. It's about oils, limescale and standing water.
A lot of CPAP cleaning advice online implies that a dirty hose will give you a chest infection. The evidence for that in otherwise healthy people using their own equipment at home is weak, and overstating it is how people end up spending £250 on a sanitising gadget they didn't need.
What's actually established is less dramatic and more useful:
Facial oils destroy cushions. This is the big one. Silicone absorbs the oils from your skin, softens, stretches and stops holding its shape — and then it leaks. The difference between a cushion lasting four weeks and twelve is almost entirely down to whether it gets washed and whether you go to bed with a clean face.
Standing water grows things. A humidifier chamber left full and warm all day is the one genuinely hospitable environment in the whole system. Empty it each morning and the problem disappears.
Limescale ruins chambers. In hard-water parts of the UK, deposits will finish a water chamber long before wear does.
Residue irritates skin. Most "I'm allergic to my mask" cases are soap residue that wasn't rinsed off properly, or a scented product that shouldn't have been near silicone in the first place.
So the goal isn't sterility
It's keeping oils off the cushion, water out of the chamber during the day, and the inside of the hose clear. That takes about two minutes each morning and a slightly longer wash once a week. Everything below is detail on those two things.
If you'd rather know when to stop cleaning something and replace it instead, that's a separate question with a separate answer — see our CPAP replacement schedule.
Daily, weekly, monthly.
Three lists instead of twelve separate habits. If you only do the daily column, you'll still get most of the benefit.
| How often | What | How |
|---|---|---|
| Every morning | Cushion or nasal pillows | Warm water, mild unscented soap. Rub the sealing edge between your fingers. Rinse well, air dry out of sunlight |
| Every morning | Humidifier chamber | Empty it, rinse, leave to air dry. Never leave water sitting in it through the day |
| Every morning | Your face | Wash before bed, not after. Skip night-time moisturiser — it's the main thing shortening cushion life |
| Weekly | Mask frame and headgear | Hand wash in warm soapy water, squeeze out gently, air dry flat. Don't wring the straps |
| Weekly | Hose | Soapy water through the full length, rinse, hang to drip dry with both ends down |
| Weekly | Reusable foam filter | Rinse under the tap, squeeze dry, refit only when completely dry |
| Weekly | Machine exterior | Wipe with a dry or very slightly damp cloth. Never let water near the air outlet |
| Monthly | Humidifier chamber, properly | Soak in one part white vinegar to three parts water for 20–30 minutes, then rinse thoroughly |
| Monthly | Disposable fine filter | Replace. Sooner if it's visibly grey, or you have pets or carpets |
| Monthly | Everything, inspected | Flex the frame looking for hairline cracks, check the hose for pinholes, check the vent holes are clear |
The one thing people get backwards
Most people wash their face in the morning and moisturise at night. For CPAP users that's exactly the wrong way round. Oils and creams applied before bed transfer straight onto the cushion and are the single biggest cause of early cushion failure. Wash before bed, and if you need moisturiser, use it in the morning.
How to clean each piece properly.
Detach it from the frame first — cleaning it in place never gets the sealing edge properly. Wash in warm water with a small amount of mild, unscented soap, and rub the sealing membrane gently between your fingertips. That rubbing action is what lifts facial oils; running water alone doesn't.
Rinse thoroughly. Soap residue is a far more common cause of "mask irritation" than any allergy, and it also makes silicone go tacky. Then air dry away from direct sunlight — UV hardens silicone and stiffens the sealing edge, so a sunny windowsill is the worst place you could choose.
If the cushion feels sticky or slack after washing, washing won't fix it. That's silicone that has absorbed too much oil, and it's due for replacement.
Fill a clean sink or basin with warm soapy water, disconnect the hose at both ends, and submerge it. Let water run right through the full length rather than just swirling it — hold one end up and let the hose fill, then lower it and let it drain. Repeat two or three times with clean water to rinse.
Hang it to dry with both ends pointing down, over a shower rail or a door handle, so water drains out rather than pooling in the middle. A hose with water sitting in a low loop takes all day to dry and is where that film comes from.
A long flexible brush makes this easier, particularly if you've let it go a few weeks — but go gently, and never push a brush into a mask cushion or anywhere near the vent holes. Brushes are for hoses.
Hand wash weekly in warm soapy water. Headgear absorbs sweat and hair products, and those are what break the elastic down — straps that have gone stiff and shiny usually haven't been washed.
Squeeze, don't wring. Twisting the straps damages the elastic fibres and is a quick way to lose the recovery that holds your mask in place. Press them between a towel instead, then dry flat, away from radiators.
While the frame is apart, flex it gently and look closely at the cushion clips and strap slots. Hairline cracks there are easy to miss and they're why a brand-new cushion sometimes still leaks.
Empty it every single morning. This is the highest-value habit in the whole routine and it takes five seconds. Warm standing water in a closed chamber all day is the one part of a CPAP setup that genuinely grows things.
Rinse daily, and once a month soak it in one part white vinegar to three parts water for twenty to thirty minutes to clear mineral deposits, then rinse very thoroughly. Vinegar is the only household product in this guide that belongs anywhere near your equipment, and this is the only job it's for.
Check whether your chamber is dishwasher-safe before assuming it is — some are, many aren't, and the ones that aren't go cloudy and brittle after a couple of cycles. The manual settles it in one line.
Reusable foam filters are rinsed under the tap weekly, squeezed gently and left until completely dry before refitting. A damp filter restricts airflow and can draw moisture into the machine.
Disposable fine filters are not washable — rinsing one destroys the filter medium even though it still looks intact. Replace them monthly, or fortnightly if you have pets, carpets, or building work nearby.
Filters are the cheapest part in the system and the most forgotten. A grey filter makes the motor work harder and is a very cheap explanation for morning congestion.
The machine needs almost nothing: a wipe over the outside with a dry or barely damp cloth, weekly. Never let water get into the air outlet, and never submerge or spray any part of the unit.
Keep the air inlet clear — not pushed against a wall, not under a pile of bedding, not on carpet that feeds it dust. And don't run it without a filter fitted, even for one night.
One of these you wash. The other you must never wash.
This is the single most important distinction in this guide, and the one people get wrong most expensively. If you're not sure which you have: foam looks and feels like dense sponge, silicone is smooth and rubbery.
Why foam is worth it anyway
A monthly replacement cycle and a wipe-only rule sounds like a downside, and on paper it is. But memory foam moulds to your face instead of pressing against it, which makes it the answer for people who get red marks, sore spots or irritated skin from silicone. If silicone has never suited you, the care routine is a fair trade.
Both types fit the same mask frame, so switching costs you a cushion rather than a mask.
What never to use on CPAP equipment.
Most damaged masks we hear about weren't worn out. They were cleaned with the wrong thing.
Ozone and UV sanitisers: what you should know.
We don't sell these, and this is why. It's the one piece of CPAP kit where the marketing and the regulatory position point in opposite directions.
What this means in practice
Soap and water, properly done, is what every machine and mask manufacturer actually instructs — and it reaches the inside of a hose, which UV light cannot. It costs nothing and it's two minutes a day.
If you already own a sanitiser, it's worth reading your machine's warranty terms and your mask manufacturer's cleaning instructions before you use it again, particularly if your equipment is still within warranty or supplied by an NHS service. If you're considering buying one, our view is that the money is better spent on replacing your cushion on time, which has a far bigger effect on how your therapy feels.
This is a fast-moving regulatory area, so check the current position with your provider or clinic if it matters to you.
Limescale will finish your water chamber before wear does.
Much of the south and east of England sits in hard-water territory, and if you're filling your humidifier from the tap you'll see the result within weeks: a white, chalky film on the chamber that gets progressively harder to shift. Left long enough it becomes permanent, and the chamber is scrap.
Two fixes, and the first one is close to a complete solution:
Use distilled water. It contains no minerals, so there's nothing to deposit. A few litres lasts a long time and costs very little per night. This is what manufacturers generally recommend, and in a hard-water area it roughly doubles the useful life of a chamber.
Soak monthly in diluted white vinegar. One part vinegar to three parts water, twenty to thirty minutes, then rinse very thoroughly — you don't want to breathe vinegar. This clears deposits before they set. Once deposits no longer come away with a vinegar soak, the chamber is due for replacement rather than more scrubbing.
Filtered water from a jug filter is better than straight tap water but not as good as distilled; it reduces minerals rather than removing them. Bottled mineral water is the worst choice of all — the clue is in the name.
What to do if you find mould.
Usually black or pink spotting inside the hose or around the chamber seal, and almost always because water sat somewhere warm for too long.
Don't try to rescue a mouldy hose. Replace it. You cannot reliably clean the full interior of a flexible ribbed tube, bleach will degrade it, and a hose is one of the cheaper parts in the system. The same goes for a mouldy water chamber or a cushion with visible growth on it — replace rather than treat.
Do check the machine. Look at the air outlet and inside the humidifier housing. If you can see growth inside the machine itself, stop using it and speak to your provider or clinic — that isn't a user-serviceable job, and nothing you pour into it will help.
Then fix the cause, or it will come back:
Empty the chamber every morning without exception. Dry the hose fully with both ends pointing down rather than coiling it damp. Don't store your equipment in a sealed bag while it's still wet. And keep the machine below mattress height so condensation drains away from the mask rather than pooling in a low loop of hose.
If you're getting persistent condensation — water gurgling in the hose, a wet mask in the morning — that's rainout rather than a cleaning failure. Lower the humidity a step, raise the tube temperature if your machine supports it, and see our guide on CPAP side effects for the humidity balance.
Cleaning in a hotel room.
You don't need to recreate the full routine on a four-night trip. The priorities shrink to two: keep the cushion clean, and don't let water sit anywhere.
Wipe the cushion each morning with a CPAP mask wipe, or with a damp cloth and a little hotel hand soap if it's unscented. Empty the humidifier chamber every morning and leave it open to dry — or travel with the humidifier empty altogether and use a nasal saline spray instead, which is what a lot of people do on short trips.
Give the hose a proper soapy wash when you get home rather than attempting it in a hotel bathroom where it won't dry properly. A damp hose packed into a case is exactly how mould starts.
One worth knowing: don't use a hotel kettle to sterilise anything. Boiling water deforms mask parts, and it's not a popular move with housekeeping either.
Six things people get wrong about cleaning CPAP equipment.
Four things, and three of them you already own.
Mild unscented soap, warm water, white vinegar once a month, and a clean towel. Everything below is for when cleaning is no longer the answer.
Quick answers on cleaning CPAP equipment.
What soap should I use to clean my CPAP mask?
A mild, unscented soap and warm water. Avoid antibacterial and scented washing-up liquids, which contain degreasers and fragrances that are harsh on silicone and leave residue that irritates skin.
Rinse thoroughly afterwards. Soap residue is a far more common cause of mask irritation than any genuine allergy, and it also makes silicone go tacky.
Can you use vinegar to clean CPAP equipment?
Yes, for one job: descaling the humidifier water chamber. Soak it monthly in one part white vinegar to three parts water for twenty to thirty minutes, then rinse very thoroughly.
Don't use vinegar on cushions, hoses, headgear or the machine itself. For everything else, mild unscented soap and warm water is what manufacturers specify.
Can I put CPAP parts in the dishwasher?
Not masks, cushions or hoses — dishwasher heat warps and hardens them, and the detergents are too harsh for silicone.
Some humidifier water chambers are dishwasher-safe on the top rack, but many aren't and go cloudy and brittle after a couple of cycles. Check your machine's manual rather than assuming; it answers the question in one line.
Can I wash a memory foam CPAP cushion?
No. Memory foam cushions must never be washed, rinsed or submerged — water breaks down the foam structure immediately and permanently. Wipe them with a damp cloth only, then let them air dry fully.
This is the main practical difference between the two cushion materials. Silicone is fully washable and lasts one to three months; foam is wipe-only and replaced about monthly, and in exchange it moulds to your face rather than pressing against it.
How often should I clean my CPAP hose?
Weekly. Disconnect it at both ends, let warm soapy water run through the full length two or three times, rinse, then hang it with both ends pointing down so the water drains out rather than pooling in the middle.
If there's a film inside you can't rinse away, that's the point to replace the hose rather than scrub harder. Standard tubing is due every three months anyway.
Are ozone or UV CPAP sanitisers safe to use?
The FDA has issued a safety communication stating that ozone and UV light CPAP cleaning devices are not legally marketed for this use and that their safety and effectiveness have not been demonstrated. Ozone can be released above recognised safety limits and can degrade the plastics and silicone in your equipment, and both ResMed and Philips state that using these devices can void your warranty.
Soap and water is what every manufacturer instructs, and it reaches the inside of a hose, which UV light cannot. If you already own a sanitiser, check your warranty terms and your mask manufacturer's cleaning instructions before using it again. This is a fast-moving area, so confirm the current position with your provider if it matters to you.
What water should I use in my CPAP humidifier?
Distilled water, particularly in the hard-water areas that cover much of the south and east of England. It contains no minerals, so there's nothing to deposit, and in a hard-water area it roughly doubles the useful life of a water chamber.
Filtered water from a jug is better than straight tap water but still leaves some minerals. Bottled mineral water is the worst option. Never add essential oils or scented products to the chamber.
I've found mould in my CPAP hose. What should I do?
Replace the hose rather than trying to clean it. You can't reliably clean the full interior of a flexible ribbed tube, bleach would degrade it, and tubing is one of the cheaper parts in the system. The same applies to a mouldy water chamber or a cushion with visible growth.
Then fix the cause: empty the chamber every morning, dry the hose with both ends pointing down, don't store equipment damp in a sealed bag, and keep the machine below mattress height. If you can see growth inside the machine itself, stop using it and contact your provider or clinic.
Why does my mask irritate my skin even though I clean it?
Most often it's soap residue rather than the mask material. Rinse more thoroughly, and switch to a plain unscented soap if you've been using anything antibacterial or fragranced.
The other common causes are over-tightening, which presses the cushion into your skin all night, and a cushion that's past its replacement date and no longer sealing without extra tension. If skin is broken, blistered or not recovering between nights, speak to your clinic rather than persevering.
Does cleaning my equipment less often make me ill?
The evidence that a poorly cleaned CPAP causes chest infections in otherwise healthy home users is weak, and a lot of cleaning content online overstates it. What does reliably happen is less dramatic: facial oils destroy cushions early, standing water in the humidifier grows things, limescale ruins chambers, and soap residue irritates skin.
So clean because it keeps your equipment working and your therapy comfortable, not out of fear. If you have a weakened immune system or a chronic lung condition, follow your clinician's advice rather than general guidance.
More UK-specific CPAP guidance.
This guide is for general educational purposes only and is not a substitute for personalised medical advice or for the instructions supplied with your own equipment. Cleaning requirements vary between machines, masks and humidifiers — always follow your own manufacturer's instructions and your clinic's guidance where these differ, and check your warranty terms before using any third-party cleaning device.
If you have a weakened immune system or a chronic lung condition, follow your clinician's advice on equipment hygiene rather than general guidance. Stop using equipment and contact your provider or sleep clinic if you find mould inside the machine itself, if skin irritation has broken the skin, or if your therapy feels less effective despite clean, in-date parts. Never adjust your prescribed pressure settings yourself.
