If your thermocouple is dirty, you’ll need to clean it before using it again. There are a few different ways to do this, depending on the type of thermocouple. For metal-based thermocouples, you can use a wire brush to remove the dirt and corrosion. Make sure to wear gloves and eye protection when doing this, as the wire brush can be dangerous if it gets into your eyes. For plastic-based thermocouples, you can use a mild soap and water solution. Make sure to rinse the thermocouple thoroughly after cleaning it this way, as soap can leave residue that will affect its accuracy. ..