My SWG cell doesn’t appear dirty. However, in getting ready for the upcoming season I thought I would clean it. The manual says to use either distilled white vinegar or 10 parts water and 1 part Muriatic Acid. I chose the acid thinking it would be a more thorough cleaning. The directions say to wait for the foaming to stop after about 5 or 10 mins and then dispose of the acid carefully or put it in your pool. It never foamed at all. Even after shaking it, it never foamed. Did I do something wrong or was my cell just not that dirty? Just wondering if I actually did anything to clean my cell? Any opinions?