The fogging is really micro-pitting and then once pitted fine grit finds its way into the pits and depending on the plastic may stain it as well - especially if there is iron content. I was trying to find a website for one of these polishes that had photos under a microscope showing what was going on, but couldn't find it. Maybe someone else knows what I am talking about and can link it. In the end you are just removing a thin layer of the plastic comprised of this micro-pitted layer. Applying your favorite wax or sealant will help, but I would just repeat the polishing process next time you don't like the look of them. It would take you a month off Sundays to wear through the plastic with that fine of a polish.
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