POM -- Not safe to put them in them in the DW? I'm assuming you mean health-wise here, since I replace them with frequency... Why? I mostly use stainless steel, too, Belgique, which I like. The non-stick finishes are for eggs & small fry-ups. I don't wash my teapot often -- I just rinse it out with boiling water.
CI -- Coir is the heavy brown bristly fiber of coconut husks. My best brush is about six inches long that is bent back upon itself & wired down, so it is really about three inches long -- no handle. Scrubs up a storm. I think it is the same as the Turtle Tawashi - Vegetable Brush. I found an image of one but it was a gif, so here's that website:
Vegetable Brush
Osso -- That coating .... ewww ... imo, if you have that much (which I wouldn't) when you heat up the pan you're supposed to wipe it out with a paper towel to get rid of it all. My iron skillets are old... some older than I am, I think, and they're beautifully seasoned, but I always "wipe on, wipe off" oil before I cook.
Roger -- Makes sense. Heating should be getting rid of any bacteria... but I wash all my pans anyway.