Final answer:
Before using a thermometer, clean it with soap and warm water. After each use, disinfect it with rubbing alcohol or a disinfectant wipe.
Step-by-step explanation:
Before using a thermometer, it should be cleaned with soap and warm water to remove any dirt or debris. After each use, the thermometer should be disinfected with rubbing alcohol or a disinfectant wipe. This helps to kill any bacteria that may be present.