To properly clean a thermometer, use soap and warm water or isopropyl alcohol, ensuring it’s disinfected without damaging the sensor or display.
Keeping your thermometer clean is crucial for preventing the spread of germs and infections. Whether you use a digital, forehead, or rectal thermometer, proper disinfection ensures accurate readings and protects your family’s health.
Why Thermometer Cleaning Matters
Thermometers can harbor dangerous bacteria like E. coli, salmonella, and even viruses if not cleaned properly. The CDC recommends disinfecting medical devices that come into contact with bodily fluids or mucous membranes.
Key Risks of Unclean Thermometers
- Spread of infections between family members
- False temperature readings from residue buildup
- Potential damage to thermometer sensors
Materials Needed for Cleaning
| Material | Purpose |
|---|---|
| Isopropyl alcohol (60%+) | Primary disinfectant |
| Cotton balls/pads | Application surface |
| Mild soap | Alternative cleaner |
| Lukewarm water | Rinsing |
| Clean, dry cloth | Drying |
How to Clean Different Thermometer Types
Digital Thermometers
- Wash hands thoroughly before handling
- Dip cotton ball in 70% isopropyl alcohol
- Wipe entire probe and casing
- Use cotton swab for crevices
- Rinse probe tip under lukewarm water if needed
- Air dry completely before storage
Important Notes:
Never submerge digital components. Avoid hot water as it can damage sensors. For oral thermometers used by multiple people, consider color-coded probe covers.
Forehead (Infrared) Thermometers
While these often don’t touch skin, they still require cleaning:
- Wipe sensor window gently with alcohol pad
- Clean body with disinfectant wipe
- Never spray liquid directly on device
- Refer to manufacturer’s instructions
Rectal Thermometers
These require extra care due to contact with bodily fluids:
- Clean immediately after each use
- Use higher concentration alcohol (70-90%)
- Consider dedicated thermometer for each child
- Store in clean, labeled container
Common Cleaning Mistakes to Avoid
Improper Drying
Moisture promotes bacterial growth. Always air dry completely before storing.
Using Harsh Chemicals
Bleach can damage thermometer materials. Stick to recommended cleaners.
Neglecting Storage
Store in clean, dry case away from direct sunlight. The FDA recommends keeping thermometers in their protective cases when not in use.
When to Replace Your Thermometer
Even with proper cleaning, thermometers don’t last forever. Replace if you notice:
- Cracks in casing or probe
- Inconsistent readings
- Discoloration that won’t clean off
- Battery compartment corrosion
Special Considerations for COVID-19
During infectious disease outbreaks:
- Increase cleaning frequency
- Consider disposable probe covers
- Designate one thermometer per person when possible
- Wear gloves when cleaning if handling multiple devices
