The rotors and interior should be cleaned & maintained regularly, normally once in a month. 1) Unplug the power cord and remove the rotor after the test. 2) Use a soft, moist cloth and neutral cleaning solutions (alcohol or alcohol-based disinfectant) to clean the rotor and interior chamber. Diluted 70% ethanol can be used for disinfection purpose. Note: Do not pour water directly into the chamber. Any spill should be wiped immediately before using. 3）After wiping or rinsing the rotor with clean water, leave it to dry before installing.