The cleaning process varies from model to model. To clean Braun Thermoscan 3 (IRT3030), 5 (IRT6020) and 7 (IRT6520), the instruction is as follows. All you need to do is, gently wipe the surface of the probe tip with a cotton swab. You can also use a soft cloth that's moistened with rubbing alcohol (70% Isopropyl).