How clean is "clean enough" when removing creosote from a clay flue tile liner before installing a stainless steel liner? I know that if enough creosote is left behind in the flue that the new liner can still get hot enough to ignite the creosote deposits. Are the following pictures "clean enough" or is that creosote still too much and definitely has to be removed?
![[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining](https://www.hearth.com/talk/attachments/img_1599-webp.329134/ "[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining")
![[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining](https://www.hearth.com/talk/attachments/img_1601-webp.329135/ "[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining")
![[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining](https://www.hearth.com/talk/attachments/img_1602-webp.329136/ "[Hearth.com] Getting Clay Flue Liner Clean Before Re-lining")
Getting Clay Flue Liner Clean Before Re-lining
- Thread starter pkay
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Ctwoodtick
Minister of Fire
I’m not a professional, but that looks like some stage 3 glazed creosote that could not come off with a normal brush sweeping of chimney. I could be wrong, but the pics are a a little blurry. Also not sure how widespread the deposits are in your system. An option is to have the clay broken out prior to install of new insulated liner. I’d go in that direction. Will add to the cost of install but then you can sleep better.
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