I am not the SWCG expert around here but I don't think you want to use vinegar. I did a little research before replying to your post and I found the following post written by one of our support team members in regards to an Aqua-Rite unit. You did not say what type you have but I suspect that the procedure would be the same for other types as well. If there is any question, you should check the manual that came with your unit.

From a previous post: Do not use vinegar or dry acid to clean your cell. You use a 4:1 mix of water to muriatic acid as explained in the AquaRite manual (http://www.hayward-pool.com/pdf/manuals/Manual239.pdf) on page 8,which I will quote:
Mild Acid Washing: Use only in severe cases where flushing and scraping will not
remove the majority of deposits. To acid wash, turn off power to Aqua Rite. Remove
cell from piping. In a clean plastic container, mix a 4:1 solution of water to muriatic acid
(one gallon of water to one quart of muriatic acid). ALWAYS ADD ACID TO WATER -
NEVER ADD WATER TO ACID. Be sure to wear rubber gloves and appropriate eye
protection. The level of the solution in the container should just reach the top of the
cell so that the wire harness compartment is NOT submerged. It may be helpful to coil
the wiring before immersing the cell. The cell should soak for a few minutes and then
rinse with a high pressure garden hose. If any deposits are still visible, repeat soaking
and rinsing. Replace cell and inspect again periodically.