Do not immerse the remote control or the TensRelief units in water or rinse them under the tap. Do not immerse the electrodes in water. Clean the remote control, the charger, the TensRelief units and the extension cable (PR3094 only) with a damp cloth and a mild cleaning agent, e.g. washing up liquid. You can also clean them with 70% isopropyl alcohol (IPA). Caution: Do not use any other cleaning agents other than the ones mentioned above, as these cleaning agents could damage the material, e.g. cause loss of gloss. If the electrodes are dirty, put a drop of water on your finger and gently rub the dirt off the surface. Do not use soap or alcohol to clean the electrodes.