Most incentive spirometers are simple, single-patient plastic devices that need only a basic warm-water rinse and thorough air drying between uses. No special disinfectant is required for everyday home care. The real challenge is not the cleaning method itself but the details people overlook: trapped moisture that breeds bacteria, soap residue that can be inhaled, and knowing when to stop cleaning and simply replace the device. Getting these details right keeps the spirometer safe and functional throughout your recovery.
Why a Breath-Powered Device Gets Dirty
Every time you exhale or inhale through an incentive spirometer, you push warm, moist air loaded with saliva droplets and oral bacteria into the mouthpiece, tubing, and chamber. Research on spirometry equipment has shown that mouthpieces quickly become contaminated with a patient’s oral flora and associated respiratory pathogens, and that roughly 14 percent of connected tubing also picks up those organisms after use.1PubMed. Infection risks associated with spirometry While incentive spirometers differ from the diagnostic spirometers used in that research, the underlying physics is the same: your breath carries microbes into the device.
Studies of spirometry equipment in clinical settings have recovered potentially dangerous organisms including Pseudomonas species, coagulase-negative Staphylococcus, and Alcaligenes species from devices that appeared visually clean.2Australian Family Physician. Microbiological contamination of spirometers An exploratory study in general practice Another investigation found that Burkholderia cepacia and Pseudomonas fluorescens were among the most frequently isolated bacteria in spirometers, along with Penicillium mold.3European Respiratory Journal. Bacterial colonization as a potential source of nosocomial respiratory infections in two types of spirometer None of this means your incentive spirometer is guaranteed to harbor dangerous pathogens, but it does mean that skipping regular cleaning gives bacteria and mold a warm, damp environment to grow in, exactly where you will be breathing deeply from.
The Basic Cleaning Routine
For a standard, single-patient incentive spirometer used at home or in the hospital, cleaning does not require anything elaborate. Here is what works:
- Disassemble: Pull the mouthpiece off the flexible tubing, and if possible separate the tubing from the main chamber. Most models snap apart easily.
- Rinse with warm water: Run warm (not hot) tap water through each piece. Swirl water inside the chamber if you can. The goal is to flush out saliva and any visible moisture residue.
- Shake out excess water: Give each component a good shake to remove standing droplets, especially inside the tubing where water tends to pool.
- Air dry completely: Set every piece on a clean towel in an open area where air circulates. Do not reassemble the spirometer until all parts are fully dry to the touch, inside and out.
That is the core routine. It should be done after each use session if possible, and at minimum once daily during the period you are actively using the device. Most hospital discharge instructions and manufacturer pamphlets recommend this basic approach.
What Not to Use
People often assume that a more aggressive cleaning agent must be better, but incentive spirometers are a case where less is more. The device channels air directly into your lungs, so anything left behind on interior surfaces becomes something you inhale.
Dish soap is the most common culprit. A tiny film of surfactant clinging to the inside of the tubing or chamber is easy to miss, and when you take a deep sustained breath through the device, you pull that residue into your airway. If you do use a small drop of mild soap on the mouthpiece for visible grime, rinse it extremely thoroughly, at least several passes under running water, and still allow it to dry completely.
Bleach, rubbing alcohol, hydrogen peroxide, and commercial disinfectant sprays should all be avoided inside the device unless your healthcare provider specifically instructs otherwise. These chemicals are designed for hard surfaces, not for the interior of something you breathe through repeatedly. Alcohol can also degrade certain plastics over time, potentially causing cracks or clouding that make it harder to see the piston or ball indicators inside the chamber.
The dishwasher is another temptation, but the high heat can warp the lightweight plastic of most incentive spirometers, distorting the chamber walls and throwing off the calibration that lets you track your breathing progress. Even a “gentle” cycle reaches temperatures that many of these devices are not rated for.
Why Drying Matters More Than Washing
If there is one step people rush or skip entirely, it is drying. Reassembling the spirometer while the inside is still damp creates exactly the conditions bacteria and mold need. The tubing is a particular problem because water droplets cling to its inner walls and the ends are narrow enough to slow evaporation.
Some practical approaches help: hang the tubing over a towel rack or the edge of a counter so both ends point downward, letting gravity pull water out. If you have a clean dish-drying rack, drape the tubing and stand the chamber upside down on it. A few people use a hairdryer on a cool setting to speed up the process, which is fine as long as you keep the heat low enough to avoid warping plastic.
In a humid bathroom, drying can take much longer than in a well-ventilated room. If your home is humid, consider placing the disassembled spirometer near an open window or in a room with a fan. The chamber itself usually dries quickly because of its larger openings, but always check the tubing by looking through it toward a light source. If you see any water beads clinging inside, it is not ready to be reassembled.
How Often You Should Clean
Most manufacturers and respiratory therapists recommend cleaning the device once a day during active use. If you are using your spirometer ten times a day as part of a postoperative routine, a daily rinse-and-dry cycle at the end of the day is the standard advice. Some clinicians suggest rinsing the mouthpiece after every session and doing a full disassembly and rinse once per day.
There is no research establishing an exact contamination threshold for incentive spirometers specifically, meaning the once-daily recommendation is a practical guideline based on general respiratory device hygiene rather than a precise safety cutoff. But the logic is reasonable: by the end of a day of repeated deep-breathing sessions, there is enough accumulated saliva and moisture in the device to support microbial growth, especially if it sits on a nightstand in a warm hospital room or bedroom.
If you miss a day of cleaning, do not panic, just clean it the next time you think of it. The risk accumulates gradually. Where people get into trouble is when they stop cleaning for the entire duration of use, which can be weeks after surgery, and the device becomes a miniature incubator they breathe from several times a day.
When to Replace Instead of Clean
Incentive spirometers are inexpensive, disposable medical devices. Most cost a few dollars, and they are designed to be used by a single patient for a limited recovery period. Knowing when to replace one rather than continuing to clean it can save you from fighting a losing battle against contamination.
Replace the device if:
- Visible discoloration: Yellow, brown, or green staining inside the chamber or tubing that does not rinse away with water likely indicates mold or bacterial biofilm.
- Persistent odor: A musty or sour smell after cleaning suggests microbial colonization that simple rinsing cannot remove.
- Cracked or warped plastic: Damage to the chamber can alter its air resistance, making your volume readings inaccurate and your breathing exercises less effective.
- Prolonged use: If your recovery extends beyond the typical two to four weeks, ask your provider whether a fresh spirometer would be appropriate. Extended daily use means extended daily contamination.
- After a respiratory infection: If you develop pneumonia, bronchitis, or another respiratory illness while using the spirometer, replace it. The device may harbor the very organisms you are trying to recover from.
Trying to deep-clean a device that costs less than a cup of coffee is usually not worth the effort or the risk of inhaling cleaning chemical residue. If the device looks or smells off, getting a new one is the safer and simpler option.
Cleaning Considerations for Higher-Risk Patients
For most post-surgical patients with healthy immune systems, the warm-water routine described above is sufficient. But certain groups face elevated risks from device contamination and may need a stricter approach.
Research on airway clearance devices used by people with cystic fibrosis illustrates the challenge. In one study, nearly all devices tested (28 out of 30) were contaminated before cleaning. After a cleaning protocol, complete eradication of organisms was achieved in only half the samples, with partial eradication in another 30 percent. In four cases, cleaning was completely ineffective at removing bacteria.4PubMed Central. Cleaning and infection control of airway clearance devices used by CF patients While incentive spirometers are simpler devices than some of the airway clearance tools in that study, the principle applies: even diligent cleaning does not guarantee a sterile device, and for patients whose lungs are already compromised, the margin for error is thinner.
If you are immunocompromised, have cystic fibrosis, have COPD with frequent exacerbations, or are recovering from a lung transplant, talk with your respiratory therapist about whether a more structured cleaning protocol makes sense. Some clinicians in these situations recommend using a dilute vinegar solution (one part white vinegar to three parts water) followed by a very thorough rinse with clean water, while others advise more frequent device replacement. The key is that these higher-risk patients should not simply follow the generic instructions printed on the spirometer’s packaging and assume they are adequately protected.
The Bigger Problem With Incentive Spirometers Is Not Cleaning
A dirty spirometer is a real concern, but for most patients the more consequential issue is that they barely use the device at all, or use it incorrectly. A large national survey of healthcare providers found that the vast majority, about 86 percent, agreed that patient adherence to incentive spirometry is poor. The most commonly cited reasons were that patients forget to use their spirometers, do not use them effectively when they do, and do not use them frequently enough.5Respiratory Care. Incentive Spirometry Adherence: A National Survey of Provider Perspectives
This matters for the cleaning question because a spirometer sitting unused on a nightstand still collects dust and ambient airborne particles, especially in a hospital environment. If you have not touched the device in two days and then pick it up for a session without rinsing it first, you may be inhaling whatever has settled inside. Even on days you skip the breathing exercises, a quick rinse and dry of the mouthpiece before your next use is a good habit.
Common technique errors compound the problem. Taking short, sharp breaths instead of slow, sustained inhalations is the most frequent mistake. Holding the device at an angle instead of upright can make the piston or ball respond inaccurately. And failing to hold your breath for a few seconds at peak inhalation reduces the exercise’s ability to open collapsed air sacs in the lungs. None of these technique issues relate to cleaning per se, but a patient who is confused about how to use the device is also likely to be confused about how to care for it.
Storing the Device Between Sessions
Where you keep the spirometer between uses affects how quickly it picks up contaminants. In a hospital room, devices are often left on the bedside table alongside water cups, tissues, and meal trays. That puts them in the splash zone for food particles, liquid spills, and the general microbial traffic of a shared space. At home, the bathroom is probably the worst storage spot because of the constant humidity.
A simple improvement: after cleaning and drying, place the disassembled spirometer inside a clean, dry zip-top plastic bag with the top loosely open so air can still circulate but dust and splashes are blocked. Some patients use a small mesh bag for the same purpose. The point is to keep ambient contaminants off the device without sealing in any residual moisture.
Keep the spirometer away from direct sunlight as well. Prolonged UV exposure can make thin plastic brittle and cloudy, which reduces the visibility of the piston or ball indicator inside the chamber. You need to see those indicators clearly to track your progress, so a shaded, dry spot on a shelf or countertop is ideal. If you are bringing the spirometer with you during the day, a small clean pouch in a bag works, just make sure it is fully dry before you seal it up.
Shared Devices and Hospital Settings
Incentive spirometers are classified as single-patient devices. They should never be shared between patients, even after cleaning. The research on spirometry equipment colonization makes it clear that standard cleaning does not reliably sterilize these plastic devices. Mouthpieces in particular are considered contaminated after a single patient uses them, with oral flora transferring readily to the plastic surface.1PubMed. Infection risks associated with spirometry
In a hospital, your spirometer should have your name on it and stay at your bedside. If it gets mixed up with another patient’s device, do not attempt to clean and reuse it. Request a new one. The cost is trivial compared to the risk of cross-contamination, especially on a surgical ward where patients may have open wounds and suppressed immune function.
At home, the same rule applies within a household. If two family members are recovering from surgery simultaneously, each needs their own spirometer. The devices look identical, so labeling them with a piece of tape and a marker prevents accidental swaps. Even between family members who live together and share everyday items, respiratory devices are in a different category because they channel air directly into the lower lungs.
Vinegar Soaks and DIY Disinfection
Online forums and some patient handouts recommend soaking incentive spirometer components in a dilute white vinegar solution as a deeper clean. The typical recipe is one part vinegar to three parts warm water, soaked for about 15 to 20 minutes, then rinsed thoroughly and air dried. This approach has some basis: acetic acid in vinegar has mild antimicrobial properties and does not leave the kind of toxic residue that bleach or commercial disinfectants can.
That said, a vinegar soak is generally overkill for patients with healthy immune systems who are using the spirometer for a short post-surgical recovery. If you are following the daily warm-water rinse and ensuring complete drying, that is sufficient for the typical two-to-four-week use period. The vinegar soak becomes more relevant for higher-risk patients or for anyone whose use extends well beyond a month, where the cumulative contamination risk rises enough to justify the extra step.
If you do use vinegar, the rinse afterward is the critical part. Vinegar itself is not harmful to inhale in trace amounts, but the acetic acid taste and smell can be unpleasant, and some people find it irritating to already-sensitive airways. Run clean water through every component until you cannot detect any vinegar smell. Then dry everything completely before reassembling. Skipping the thorough rinse or sealing damp, vinegar-scented components together defeats the purpose.