CPAP Cleaning Myths: What the FDA Says

The CPAP Cleaning Industry Has a Problem

If you have searched for CPAP cleaning products, you have probably seen devices that promise to sanitize your equipment using ozone gas or ultraviolet light. They are typically expensive. Their marketing implies that soap and water is not enough, that dangerous bacteria are lurking in your tubing, and that only their technology can keep you safe.

The FDA disagrees. Repeatedly and publicly.

Understanding what the FDA has actually said about these devices matters because the claims being made can influence how you care for your equipment and how much money you spend doing it.

What the FDA Has Said

The 2020 Safety Communication

In February 2020, the FDA issued a safety communication stating that it had not cleared or approved any device using ozone gas or ultraviolet light to clean, disinfect, or sanitize CPAP machines, accessories, or other respiratory devices. This was not a subtle regulatory footnote. It was a direct public warning.

The communication noted that ozone can degrade certain CPAP components. It also raised concerns about residual ozone: the agency's testing found ozone levels remained elevated even after waiting the time the manufacturer recommended, and the FDA warned that ozone exposure can worsen existing respiratory disease or increase the chance of a respiratory infection. Between 2017 and 2019 the FDA received reports from people who had cough, difficulty breathing, nasal irritation, headaches, and asthma attacks after using ozone products on their equipment.

The 2024 Warning Letters

In August 2024, the FDA sent warning letters to several makers of ozone-based CPAP cleaners, including Leel Tech, Nature's Pillows, and Shenzhen Moyeah. The letters said the devices meet the definition of a medical device but were never authorized by the FDA. SoClean, the best known brand in this category, was not among the companies that received a letter.

What Changed in 2024

For years, no ozone or UV CPAP cleaner had FDA clearance at all. That changed in August 2024, when the FDA granted a first-of-its-kind clearance to one device, the SoClean 3+. The clearance is narrow. It covers use as an add-on for reducing bacteria on certain compatible masks and hoses, used after you clean them the normal way. It is not a substitute for soap and water, and the FDA still recommends washing CPAP components with mild soap and water according to the manufacturer's instructions. Every other consumer ozone or UV "sanitizer" that claims to replace cleaning remains uncleared.

Ozone Cleaners: The Science

Ozone (O3) is a powerful oxidizer that can destroy bacteria and viruses. That much is true. But the relevant question is not whether ozone kills germs. It is whether ozone, as delivered by consumer CPAP cleaning devices, effectively sanitizes CPAP equipment without causing harm.

What the FDA's Testing Found

When the FDA tested consumer ozone cleaners, it found two problems. First, several devices produced ambient ozone above the level considered safe for people to breathe. To kill bacteria reliably, ozone has to be present at a concentration that is higher than what is safe for humans, which is the core tension with these devices. Second, ozone can degrade certain CPAP components over time, which is part of why the agency flagged them.

The Residual Ozone Problem

After a cleaning cycle, ozone has to dissipate before you use your CPAP. The FDA's own testing found that ozone levels can stay elevated even after you wait the time the manufacturer recommends, because ozone trapped in dead spaces like the humidifier chamber, mask elbow, and tubing bends clears slowly. For people with asthma, COPD, or other reactive airway conditions, residual ozone is worth taking seriously, since the FDA has linked it to worsening respiratory symptoms.

UV Cleaners: The Science

Ultraviolet light, specifically UV-C at 254 nm, does kill pathogens. Hospitals use industrial UV systems to sterilize operating rooms and equipment. But consumer CPAP UV cleaners face fundamental limitations.

The Shadow Problem

UV-C is line-of-sight. It only works on surfaces it directly reaches, so it cannot get around corners, inside tubing bends, or under the lip of a mask cushion. Anything in shadow stays untreated. CPAP tubing is roughly 6 feet of curved, ridged interior surface, and a small UV wand at one end cannot reliably reach all of it. This is consistent with the FDA's finding that UV exposure varied so much that components could be left inadequately disinfected.

Bulb Degradation

UV-C bulbs lose intensity over time. Without regular bulb replacement and verification testing, the UV output may fall below the threshold needed for disinfection. Consumer devices rarely include UV intensity meters, so users have no way to verify that the device is still producing adequate UV-C levels.

What Actually Works

The major CPAP manufacturers (ResMed, Philips, Fisher and Paykel) all publish the same basic cleaning guidance:

Daily: wash your mask cushion with warm water and mild soap. Air dry. This takes about 2 minutes.
Weekly: wash your tubing, headgear, and humidifier chamber with warm soapy water. Rinse thoroughly and air dry.
Monthly: inspect your mask cushion, headgear, and tubing for wear. Replace components on the schedule recommended by your manufacturer.

That is it. No ozone. No UV. No special solutions. Mild dish soap (unscented, without moisturizers or antibacterial agents) and warm water.

For a step-by-step routine, see our complete CPAP cleaning guide. For the deeper monthly pass that pairs with the weekly wash, see CPAP deep clean (monthly).

Why Soap and Water Works

The buildup in CPAP equipment is primarily skin oils, moisture, and dead skin cells. This is not a surgical-grade contamination problem. Mild soap breaks up that oily layer and lifts it off the surface, running water flushes it away, and air drying keeps moisture from accumulating where bacteria could grow.

This is why the manufacturers and the FDA both point to soap and water rather than a machine. Washing physically removes the buildup, which an ozone or UV cycle does not do. Those devices try to treat contamination in place, without ever removing the oils and residue that a wash carries off.

The Real Risks of Not Cleaning

While the ozone and UV marketing overstates the danger, there are genuine reasons to clean your CPAP regularly:

Skin oils on mask cushions reduce the seal over time, increasing leaks. Clean cushions maintain a better seal and last longer.
Mineral deposits in the humidifier chamber from tap water can clog ports and harbor bacteria. Using distilled water and weekly cleaning prevents this. Distilled water is inexpensive, and grocery stores carry it cheapest if you would rather not order online.
Mold in tubing can develop if wet tubing is coiled and stored in a closed space. Hanging your tubing to air dry after washing prevents this.
Headgear stretching happens faster when oils accumulate in the fabric. Regular washing extends the life of headgear and maintains proper fit.

A good CPAP mask soap is formulated without moisturizers or fragrances that can degrade silicone mask cushions.

When to Replace, Not Clean

No amount of cleaning extends equipment past its service life. Watch for:

Mask cushion that no longer seals despite cleaning (replace every 1 to 3 months depending on type)
Tubing with visible discoloration, stiffness, or cracks (replace every 3 to 6 months)
Headgear that has lost elasticity (replace every 6 months)
Filters that are discolored or torn (disposable filters monthly, reusable filters every 6 months)
Humidifier chamber with permanent mineral buildup or cracks (replace every 6 to 12 months)

Your CPAP SD card data can help you spot equipment degradation. Rising leak rates over time, despite proper mask fitting, often indicate a cushion that needs replacement. Use CPAP Clarity to track your leak trends.

When to Talk to Your Doctor

If you have asthma, COPD, or other reactive airway conditions and have been using an ozone-based CPAP cleaner, mention this to your pulmonologist or sleep physician. If you notice new respiratory irritation, increased coughing, or wheezing that coincides with using a cleaning device, stop using it and discuss alternatives with your provider. If you develop persistent sinus infections or respiratory symptoms despite regular cleaning, your provider can help rule out equipment-related causes.

Skip the Gadgets. Use Soap and Water.

For routine cleaning, the FDA and every major manufacturer point to the same thing: soap and water. The one ozone device the FDA has cleared, the SoClean 3+, is a limited add-on for reducing bacteria after you have already washed your gear, not a replacement for washing it. Every other consumer ozone or UV sanitizer that claims to replace cleaning is still uncleared, and the FDA has warned about their disinfection claims and their risks to your airways and your equipment.

Warm water and mild soap, applied consistently, is what the manufacturers recommend. It costs almost nothing, takes a few minutes, and does not risk degrading your equipment.

Save the money you would spend on an ozone or UV device. Put it toward replacement supplies that actually affect your therapy quality.

Frequently Asked Questions

Is ozone CPAP cleaning safe?

Ozone is a powerful oxidizer that can destroy bacteria and viruses, but as delivered by consumer CPAP cleaning devices it carries real risks. To kill bacteria reliably, ozone has to reach a concentration higher than what is safe for people to breathe, and the FDA's testing found several devices left ozone elevated even after the recommended wait time. Ozone can also degrade CPAP components over time. Residual ozone trapped in dead spaces like the humidifier chamber and tubing bends clears slowly, which is worth taking seriously for anyone with asthma, COPD, or reactive airways. The FDA has cleared just one ozone device, the SoClean 3+, and only as a limited add-on used after normal cleaning, not as a cleaner on its own.

What has the FDA said about SoClean and ozone cleaners?

In February 2020 the FDA issued a safety communication stating it had not cleared or approved any device using ozone gas or ultraviolet light to clean CPAP equipment, and it flagged risks to your airways and your gear. In August 2024 the FDA sent warning letters to several makers of ozone cleaners, including Leel Tech, Nature's Pillows, and Shenzhen Moyeah, whose devices were never authorized. SoClean was not among them. In that same month the FDA granted SoClean's newest device, the SoClean 3+, a narrow clearance as an add-on for reducing bacteria on certain masks and hoses after regular cleaning. The FDA still recommends soap and water, and no device is cleared to replace it.

Do UV CPAP sanitizers work?

UV-C light does kill pathogens, but consumer CPAP UV cleaners face fundamental limits. UV-C only works on surfaces it directly contacts, so it cannot reach around corners, inside tubing bends, or under the lip of a mask cushion, and CPAP tubing is roughly 6 feet of curved, ridged interior surface. UV-C bulbs also lose intensity over time, and consumer devices rarely include intensity meters, so you have no way to verify the device is still producing adequate UV-C. No UV CPAP cleaner has FDA clearance.

Can I clean my CPAP without a special cleaner?

Yes, and it is what the manufacturers actually recommend. Warm water and mild soap, applied consistently, removes the buildup in CPAP equipment, which is mostly skin oils, moisture, and dead skin cells. Washing physically lifts that residue off the surface and rinses it away. An ozone or UV cycle does not remove anything, it only tries to treat contamination in place, which is why the FDA and the manufacturers point to soap and water for routine cleaning.

How often should I clean my CPAP equipment?

The major manufacturers publish the same basic schedule. Daily, wash your mask cushion with warm water and mild soap and air dry, which takes about two minutes. Weekly, wash your tubing, headgear, and humidifier chamber with warm soapy water, rinse thoroughly, and air dry. Monthly, inspect your cushion, headgear, and tubing for wear and replace components on your manufacturer's recommended schedule.

What happens if you never clean your CPAP?

While the ozone and UV marketing overstates the danger, there are genuine reasons to clean regularly. Skin oils on mask cushions reduce the seal over time and increase leaks, mineral deposits in the humidifier chamber from tap water can clog ports and harbor bacteria, and mold can develop in tubing that is coiled and stored wet. Headgear also stretches faster when oils accumulate in the fabric. Regular washing maintains the seal, extends the life of your equipment, and keeps your therapy effective.

Primary Sources

FDA: CPAP Machine Cleaning: Ozone, UV Light Products Are Not FDA Approved (opens in new tab) - the FDA's consumer guidance on ozone and UV cleaners, the risks it documented, and its recommendation to wash with mild soap and water.
FDA De Novo decision summary DEN210037 (SoClean 3+) (opens in new tab) - the August 2024 clearance of the SoClean 3+ as an adjunct for reducing bacteria on certain masks and hoses, used after regular cleaning and not as a replacement for it.
MedTech Dive: FDA cracks down on ozone cleaners for CPAP machines (opens in new tab) - reporting on the August 2024 FDA warning letters to makers of ozone cleaners and who received them.