HB wrote:I wouldn't introduce anything into the grinder's chamber that's not edible. Cafiza contains trisodium phosphate; the recommended use calls for rinsing thoroughly with water.
JoeGlo is also mostly trisodium phosphate. That being said, if you can rinse the items in question with copious water, I would not be afraid to use something like that. TSP is used in cleaning restaurant equipment quite often.... I gather it is the thing of choice to clean stainless steel urns (like iced tea urns). I was quite surprised to learn this, but now use straight TSP from the hardware store to clean beer kegs now. It's actually pretty amazing how well it works.
As for food safe, you use Cafiza and JoeGlo in your portafilter, so I hope it is considered a food grade cleaner.