1. General: Wash with a solution of liquid detergent and warm water by gently scrubbing with a soft tooth brush or soft tissue. Follow with a thorough rinse in D.I. or tap water.
2. Inorganic Deposits: Try to dissolve the deposit by immersing the electrode bulb in 0.1N Hydrochloric acid for a few minutes followed by a thorough rinse with D.I. or clean tap water. Then proceed with the general cleaning in Step 1 of this section.
3. Organic Oil, Grease Films or Fingerprints: Wash the electrode bulb with the solution in Step 1 of this section. Wash the tip with acetone. Follow with the general cleaning procedure in Step 1 of this section. Note: Depending on the extent of the oil and/or grease contamination, the electrode may be damaged beyond recovery.
4. Plugged or Dry Ceramic Liquid Junction: Try at least one of the previous 3 steps in this section. Place the electrode in KCI solution, 2M or stronger. Heat slowly to 50ºC then let cool to room temperature. Repeat as necessary.