I was cleaning out my stove last night, and when I took off the top of my stove there was very fine fluffy soot. It looked like cobwebs made of black ash.?? I have looked in my chimney and there isnt any in there, but I'm pretty sure the stove pipe from the stove to the insulated through wall pipe probably has some too. ( have to take that off when the brush gets here. If you touch them they crumble to ash so they weren't webs.... Just found it odd, and figured I would ask the experts what would cause that to happen