Salt chlorinators require regular service due to the fact that they work by passing an electric current through the pool water, however in doing so they attract particles to the negative electrode which coat it & reduce its efficiency.
When you remove the internals or electrodes from the cell, you may have to shut off valves if you pump is below pool water level.
Always try to remove the coating with a pressure hose or wipe it with a wet rag before resorting to soaking in a 1 part pool acid to 10 parts water solution for an hour. Try to only soak the actual electrodes, not the other components & terminal connections.
Wash down after with a strong hose before fitting to the system. Open valves if necessary & restart pump. If the system does not appear to be putting out a good quantity of chlorine after a clean the add some more salt to see if the output is better. If it is not the have the cell & transformer box checked by a manufacturers representative.

Salt chlorinator cell need to be replaced about each 4 years.