Got into the wood burner to get it ready for this winter. I removed the baffle to gain access to the flue, and there was already a cup, cup and a half of soot piled on top of the baffle. Brown coffee ground looking stuff. I haven't put the sooteater up the flue yet. I wonder if I had a rat scratching around in there, never heard any noises. Last winter was my first burning season, so probably used less than ideal wood, although my fires burned nicely and kept the place warm enough. Brand new SS flue, just one seasons use last year.