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Stargazing Network
Those pathetic frozen pizzas have the perfect sized pans for making sure that the slurry formed by the grit and water would stay contained.  While cleaning the turntable is not difficult, it could get messy if we did not constantly make sure the slurry was contained.  Additionally, each time that we need to go to finer grit, we HAVE to get ALL of the old coarser grit out of the system. A single piece of old grit could mess up the mirror by causing  deep scratches or pits that would have to be ground out starting with the coarser grit and then moving back toward the finer grit.
Next we had to clean up the grinding machine...