You lift the water tank out one morning and there is a chalky white ring around the bottom. The cushion feels slightly greasy. The hose has a faint smell you noticed a week ago and decided to ignore.
I have used a CPAP every night for more than fifteen years. The routine that keeps all of this from happening is smaller than most people expect. Two minutes in the morning, about ten minutes once a week, and ordinary mild soap.
The part worth reading slowly is the section on sanitizing machines, because the FDA has looked at those and reached a clear conclusion.
Why it needs doing at all
Your mask sits against your skin for seven or eight hours. It collects facial oil, sweat, and dead skin. The hose and the water tank stay warm and damp all night, which is the kind of place where mold and bacteria are happy.
Left alone, three things happen. The silicone degrades faster, so you buy cushions sooner than you need to. The gear starts to smell. And you breathe whatever is growing in there, all night, directly into your airway.
None of that needs a special product to prevent.
The daily routine
This is the one that matters most, and it takes about two minutes.
- Empty the water tank every morning. Do not leave yesterday's water sitting in it all day.
- Wipe the tank dry with a clean cloth, then leave it open to air.
- Wipe the cushion with a damp cloth or a fragrance-free wipe, to lift the oils off before they soak in.
- Refill with fresh distilled water at bedtime, not in the morning.
That last point catches people out. Water standing in a warm tank all day is exactly what you are trying to avoid.
The weekly routine
Once a week, give everything a proper wash. Sunday morning works well because the gear has all day to dry.
- Take the hose off and wash it inside and out in warm water with a little mild dishwashing liquid.
- Rinse it thoroughly with warm water until no soap remains.
- Wash the mask, cushion, and frame the same way.
- Wash the headgear by hand and let it air dry. Do not put it in the machine.
- Wash the water tank with warm water and mild detergent, then rinse well.
- Check your filter and replace or rinse it depending on the type you have.
Dry everything on a towel, flat, out of direct sunlight. Sunlight breaks down silicone and will yellow and harden your cushion over time.
Never put a wet hose back on the machine. Hang it over a door or a shower rail so the water runs out.
The soap question
Use plain, mild dishwashing liquid. That is all you need, and it is what the manufacturers recommend.
Avoid these:
- Antibacterial soap. It can damage the silicone and cause small cracks, which leads to skin irritation and a mask that stops sealing.
- Strong dish detergents. They can leave a residue you then breathe in all night.
- Scented soaps. The fragrance lingers in the silicone, and it is unpleasant at 2am.
- Bleach, alcohol, and household cleaners. They degrade the parts and leave harmful residue.
Rinsing matters as much as washing. Any soap you leave behind ends up in your airway.
About ozone and UV sanitizers
These are the machines sold as a quick way to sanitize your gear without washing it. They use ozone gas or ultraviolet light, they cost a few hundred dollars, and they are marketed hard to CPAP users.
The FDA has not authorized any of them. Not one ozone or UV product has been cleared for sale for that purpose.
That is not a technicality. The FDA has published what it found:
- Patients reported coughing, difficulty breathing, nasal irritation, headaches, and asthma attacks after using ozone based cleaners.
- FDA testing found ozone in the room at levels above what is considered safe for people to breathe.
- Ozone levels stayed high inside the machine and tubing even after waiting as long as the manufacturer told users to wait.
- UV light cannot reach inside a hose or around the bends of a mask, so parts can come out looking treated but not actually disinfected.
- Careless UV exposure risks eye injury and skin burns.
The FDA's own advice is that mild soap and water is enough for almost all CPAP accessories.
I am not telling you what to buy. I am telling you what the regulator found. These products sit on the shelf next to the legitimate ones, so it is easy to assume they were checked. They were not.
Filters, and the part people forget
Your filter protects the motor and your lungs. There are two kinds, and they are treated differently.
Disposable filters are white and are thrown away, typically twice a month. Hold one up to a light. Gray instead of white means it is due.
Reusable filters are darker and slightly foam-like. Rinse them in warm water, squeeze them out, and let them dry fully before putting them back. They are replaced about every six months.
A damp filter is worse than a dirty one, so never put one back wet.
If you get sick
When you have a cold or flu, wash the mask and hose daily rather than weekly for as long as you are ill. Your gear will hold whatever you are carrying and hand it back to you each night.
Replace the cushion afterwards if you have been unwell for a while. It is a small cost against a second round of the same bug.
Your next step
Tonight, empty and dry the water tank before bed, then refill it with distilled water. Tomorrow morning, wipe the cushion.
That is the whole daily habit. Do it for a week and it stops being something you have to remember.
If your gear already has a smell or a white crust that will not rinse off, those parts are past cleaning and need replacing. Your supplier can tell you what your plan covers. If you do not have one you trust, find a supplier near you on CPAPLocator.
*CPAPLocator.com is a directory service only. We are not a medical provider. Content is for informational purposes only. Always consult your healthcare provider.*