As most around here I let the fire go out yesterday and have yet to start one. Ran a brush down the chimney and here's what we got. I really like this new liner, takes all the guess work out of cleaning. Only about a foot at the top had much of anything. I am guessing that this was mainly from the slabs I have burnt occasionally as a friend (fellow wood burner and portable saw mill operator) told me that he has always heard that bark causes more creosote than the wood itself. I can't confirm that but maybe someone on here could comment if they have heard anything similar.