Your CPAP mask cushion needs cleaning every day, while the tubing, full mask assembly, and headgear need a weekly wash. The water chamber falls somewhere in between: empty it daily, deep clean it weekly. Sticking to this schedule prevents bacteria and mold from building up in the warm, moist environment your machine creates.
The Daily Routine
Two things need your attention every morning. First, wipe down the mask cushion or nasal pillows (the part that touches your face) with a damp cloth or wash it gently with mild soap and water. Facial oils, dead skin cells, and moisture collect on this surface every night, and leaving them there degrades the silicone seal and creates a breeding ground for bacteria.
Second, empty any remaining water from the humidifier chamber. Standing water that sits at room temperature all day is exactly where bacteria and mold thrive. Pour it out, give the chamber a quick rinse, and leave it open to air dry. This takes about 30 seconds and is the single most important thing you can do to keep your equipment safe between deeper cleanings.
The Weekly Deep Clean
Once a week, disassemble everything: the full mask system, headgear straps, tubing, and water chamber. Wash each piece in warm water with a mild, fragrance-free dish soap. For the water chamber specifically, let it soak for 30 to 60 minutes to loosen any mineral deposits or biofilm. Rinse everything thoroughly so no soap residue remains, then lay the pieces out or hang them to air dry completely before reassembling.
Tubing can be tricky to dry because of its length. Hang it over a shower rod or towel rack so both ends point downward, allowing water to drain out rather than pooling inside. Reassembling while any part is still damp defeats the purpose of cleaning, since moisture trapped in a sealed system is exactly the problem you’re trying to avoid.
Filter Replacement Schedules
Most CPAP machines use two types of filters, and each has its own timeline. Reusable foam filters (sometimes called internal filters) should be washed in warm soapy water at least twice a month and replaced entirely every three months, or sooner if the foam starts breaking down. Disposable fine-particle filters can’t be washed and need to be swapped out every two weeks.
If you’re prone to allergies or sinus infections, in-line bacteria filters are worth considering. These have a finer construction that traps bacteria and viruses, and they should be replaced every 30 days. Regardless of filter type, hold them up to light periodically. If they look discolored or clogged, replace them early rather than waiting for the scheduled date.
Why Distilled Water Matters
Distilled water is the best choice for your humidifier chamber because it’s free of both minerals and bacteria. Tap water contains minerals like calcium and magnesium that leave white crusty deposits (scaling) inside the chamber over time. Those deposits are hard to remove, can harbor bacteria in their crevices, and may shorten the life of the chamber itself. Tap water can also contain low levels of microorganisms that, once aerosolized by your machine, go directly into your airways.
If you notice any residue or discoloration in the chamber before your weekly cleaning day, clean it right away rather than waiting.
What Happens When You Skip Cleaning
A dirty CPAP doesn’t just smell musty. Bacteria and mold can colonize the water chamber, tubing, and mask, and you inhale whatever is living in that equipment for hours every night. For most healthy people, this might cause minor irritation or a stuffy nose. But if you have asthma, reactive airway disease, or any chronic lung condition, breathing in those organisms can trigger flare-ups or lead to respiratory infections. A dirty mask cushion also loses its seal as oils degrade the silicone, which means air leaks, reduced therapy effectiveness, and skin irritation or breakouts along the contact points.
What to Clean With (and What to Avoid)
Mild, fragrance-free dish soap and warm water are all you need for every component. Some manufacturers also recommend a soak in diluted white vinegar (typically one part vinegar to three parts water) for deeper disinfection of the water chamber.
Avoid harsh chemicals like bleach, rubbing alcohol, and scented soaps. These can degrade the silicone in your mask cushion and leave behind residues you don’t want to inhale. As for the ozone and UV “CPAP sanitizer” devices marketed online, the FDA has not cleared most of them and notes that both ozone gas and UV light can break down CPAP accessories like hoses and masks. The agency’s guidance is straightforward: soap and water is sufficient for keeping your equipment clean.
Quick-Reference Cleaning Schedule
- Every morning: Wipe or wash the mask cushion/nasal pillows. Empty and rinse the water chamber.
- Every week: Wash the full mask, headgear, tubing, and water chamber in warm soapy water. Soak the chamber 30 to 60 minutes. Air dry all pieces completely.
- Every two weeks: Replace disposable fine-particle filters.
- Twice a month: Wash reusable foam filters in warm soapy water.
- Every month: Replace in-line bacteria filters if you use them.
- Every three months: Replace reusable foam filters with new ones.
If you travel with your CPAP, always empty and fully dry the water chamber before packing. A sealed bag with residual moisture is an ideal incubator for bacteria, and arriving at your destination with a moldy chamber is an easy problem to prevent.