Abstract: An improved electrode cleaning system for an electrochemical sensor is disclosed. The improved electrode cleaning system includes a flexible wiper blade which is biased against a flat wiping surface formed by electrodes having a flat detection surface and a collar placed around the electrodes to prevent particulates from depositing between the electrodes. The collar is secured to the sensor by a recessed screw which also serves as a common electrical ground. The flexible blade preferably has two wiping portions for alternately wiping the electrodes and the common ground screw.