Soak the sensor in 5 - 10% Hydrochloric acid (HCl) in water solution. for 5 - 10 minutes, then rinse. If you have trouble finding 5 - 10% HCL you can buy muriatic acid at a building supply house and it is usually 20 - 30% HCL. Check the label. Dilute it with tap water to get something close to 10%.
BE VERY CAREFUL WHEN DILUTING THE ACID. USE PROTECTIVE CLOTHING (GLOVES, FACE SHIELD ETC.) ALWAYS ADD ACID TO WATER, NEVER ADD WATER TO ACID.
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