So I cleaned the ss liner today because I wanted to see how the new insert was doing with the hell I have put it through the first two months of everyday burning. Being new to this insert and having a much larger firebox than the old stove I have tried many burning techniques and I know I wasnt always generating a clean fire. I last cleaned the liner two months ago. I estimate I got about two cups of powder from the 16-18 ft liner. The wood I have been burning this year was mostly ash between 16-22% moisture. This is an uninsulated exterior chimney. I did expect some creosote because of the burning habits I have been using, now that i have my routine somewhat down and next year the wood will be that much better I should be in better shape.