Joe - the two work surfaces that come with the PK are a high temp fiber reinforced plastic, which is fine, but the surface has a rough texture sort of like a waffle/grid, and when you rub your fingers over it, it feels kinda 80 grit sandpaper texture, so when (not if) you get some fine ashes down in there, or a little grease, it's really hard to get out. I cropped an old photo and included below so if you zoom in on it, you can see the "grid" and some debris that'll come off but you can also see some dusty looking grey stuff that is really down in the grid. I've tried every sort of cleaning utensil (tooth brushes, etc) and soap I have. You can certainly clean it, and it can look "OK" but I can't get anywhere near the "like new" clean that I want. Maybe I'll post something in a new thread to see if any other PK 360 owners have any tricks... PK's customer service has no answers. I have not tried removing the table sections and submerging in any sort of soap/solution, that would be easy enough to try but don't have much confidence in it.
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